Method for transmitting and receiving channel state information in wireless communication system and apparatus therefor

ABSTRACT

Disclosed are a method for transmitting and receiving a radio signal in a wireless communication system and an apparatus therefor. Particularly, a method for performing, by a terminal, channel state information (CSI) reporting in a wireless communication system comprises the steps of: receiving, from a base station, bandwidth part (BWP) configuration information on a BWP for uplink and/or downlink transmission; receiving, from the base station, reporting configuration information including a reporting configuration for the CSI reporting; and performing the CSI reporting on the basis of the BWP configuration information and the reporting configuration information, wherein the reporting configuration is associated with the BWP, and whether or not the reporting configuration is activated may be determined on the basis of whether or not the BWP is activated.

CROSS-REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. § 119(e), this application is a continuation ofInternational Application PCT/KR2018/014122, filed on Nov. 16, 2018,which claims the benefit of U.S. Provisional Patent Application Nos.62/619,636, filed on Jan. 19, 2018, No. 62/588,155, filed on Nov. 17,2017, and No. 62/587,427, filed on Nov. 16, 2017, the contents of whichare hereby incorporated by reference herein in their entirety.

TECHNICAL FIELD

The disclosure relates to a wireless communication system, and morespecifically, to a method for communicating channel state informationand apparatus for supporting the same.

BACKGROUND

Mobile communication systems have been generally developed to providevoice services while guaranteeing user mobility. Such mobilecommunication systems have gradually expanded their coverage from voiceservices through data services up to high-speed data services. However,as current mobile communication systems suffer resource shortages andusers demand even higher-speed services, development of more advancedmobile communication systems is needed.

The requirements of the next-generation mobile communication system mayinclude supporting huge data traffic, a remarkable increase in thetransfer rate of each user, the accommodation of a significantlyincreased number of connection devices, very low end-to-end latency, andhigh energy efficiency. To this end, various techniques, such as smallcell enhancement, dual connectivity, massive multiple input multipleoutput (MIMO), in-band full duplex, non-orthogonal multiple access(NOMA), supporting super-wide band, and device networking, have beenresearched.

SUMMARY

The disclosure proposes a method for communicating channel stateinformation (CSI) in a wireless communication system.

Specifically, the disclosure proposes a method of setting asemi-persistent CSI configuration. The disclosure also proposes a methodof identifying downlink control information for the semi-persistent CSIconfiguration. The disclosure also proposes a method of settingactivation/deactivation between the semi-persistent CSI configurationand bandwidth part (BWP). The disclosure also proposes a method ofidentifying the CSI configuration related to a time division duplexing(TDD) configuration and/or slot format. The disclosure also proposes amethod of processing the validity of the CSI configuration.

It is to be understood that technical objects to be achieved by thepresent disclosure are not limited to the aforementioned technicalobject and other technical objects which are not mentioned herein willbe apparent from the following description to one of ordinary skill inthe art to which the present disclosure pertains.

According to an embodiment of the disclosure, a method of performingchannel state information (CSI) reporting by a user equipment (UE) in awireless communication system comprises receiving bandwidth part (BWP)configuration information for a BWP for uplink and/or downlinktransmission from a base station, receiving reporting configurationinformation including a reporting configuration for the CSI reportingfrom the base station, and performing the CSI reporting based on the BWPconfiguration information and the reporting configuration information.The reporting configuration may be associated with the BWP. Thereporting configuration is activated may be determined based on whetherthe BWP is activated.

Further, according to an embodiment of the disclosure, in the methodperformed by the UE, the CSI reporting may be semi-persistentlyconfigured CSI reporting.

Further, according to an embodiment of the disclosure, in the methodperformed by the UE, the CSI reporting may be performed via a physicaluplink shared channel.

Further, according to an embodiment of the disclosure, in the methodperformed by the UE, when the BWP is deactivated, the reportingconfiguration may be deactivated.

Further, according to an embodiment of the disclosure, in the methodperformed by the UE, whether the BWP is activated may be set via dynamicsignaling by the base station.

Further, according to an embodiment of the disclosure, in the methodperformed by the UE, the reporting configuration may include resourceconfiguration information related to the CSI reporting. The resourceconfiguration information may include information for the BWP.

According to an embodiment of the disclosure, a method of receivingchannel state information (CSI) by a base station in a wirelesscommunication system comprises transmitting bandwidth part (BWP)configuration information for a BWP for uplink and/or downlinktransmission to a user equipment (UE), transmitting reportingconfiguration information including a reporting configuration for theCSI reporting to the UE, and receiving the CSI reporting based on theBWP configuration information and the reporting configurationinformation from the UE. The reporting configuration may be associatedwith the BWP. Whether the reporting configuration is activated may bedetermined based on whether the BWP is activated.

Further, according to an embodiment of the disclosure, in the methodperformed by the base station, the CSI reporting may besemi-persistently configured CSI reporting.

Further, according to an embodiment of the disclosure, in the methodperformed by the base station, the CSI reporting may be performed via aphysical uplink shared channel.

Further, according to an embodiment of the disclosure, in the methodperformed by the base station, when the BWP is deactivated, thereporting configuration may be deactivated.

Further, according to an embodiment of the disclosure, in the methodperformed by the base station, whether the BWP is activated may be setvia dynamic signaling by the base station.

Further, according to an embodiment of the disclosure, in the methodperformed by the base station, the reporting configuration may includeresource configuration information related to the CSI reporting. Theresource configuration information may include information for the BWP.

According to an embodiment of the disclosure, a user equipment (UE)performing channel state information (CSI) reporting in a wirelesscommunication system comprises a radio frequency (RF) unit fortransmitting/receiving a radio signal and a processor functionallyconnected with the RF unit. The processor may perform control to receivebandwidth part (BWP) configuration information for a BWP for uplinkand/or downlink transmission from a base station, receive reportingconfiguration information including a reporting configuration for theCSI reporting from the base station, and perform the CSI reporting basedon the BWP configuration information and the reporting configurationinformation. The reporting configuration may be associated with the BWP.Whether the reporting configuration is activated may be determined basedon whether the BWP is activated.

Further, according to an embodiment of the disclosure, in the UE, theCSI reporting may be semi-persistently configured CSI reporting.

Further, according to an embodiment of the disclosure, in the UE, theCSI reporting may be performed via a physical uplink shared channel.

According to an embodiment of the disclosure, it is possible to allocatean effective uplink resource (e.g., PUSCH and PUCCH resources) to allowthe terminal to semi-persistently report (i.e., transmit) the CSI.

Further, according to an embodiment of the disclosure, it is possible todistinguish downlink control information (DCI) used for allocatinguplink resources (e.g., PUSCH and PUCCH resources) for CSI transmissionfrom other DCI without increasing the UE's blind decoding.

It will be appreciated by those skilled in the art that the effects thatcan be achieved with the present disclosure are not limited to what hasbeen described above and other advantages of the present disclosure willbe clearly understood from the following detailed description taken inconjunction with the accompanying drawings.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included herein as a part of adescription in order to help understanding of the present disclosure,provide embodiments of the present disclosure, and describe thetechnical features of the present disclosure with the description below.

FIG. 1 illustrates an example of an overall structure of a new radio(NR) system to which a method proposed by the present disclosure may beimplemented.

FIG. 2 illustrates a relationship between a uplink (UL) frame and adownlink (DL) frame in a wireless communication system to which a methodproposed by the present disclosure may be implemented.

FIG. 3 illustrates an example frame structure in an NR system.

FIG. 4 illustrates an example of a resource grid supported in a wirelesscommunication system to which a method proposed by the presentdisclosure may be implemented.

FIG. 5 illustrates examples of resource grids for each antenna port andnumerology to which a method proposed in this specification may beapplied.

FIG. 6 illustrates an example self-contained structure to which a methodproposed herein is applicable.

FIG. 7 is a flowchart illustrating an example CSI-related procedure.

FIG. 8 illustrates an example information payload of PUSCH-based CSIreporting.

FIG. 9 illustrates an example information payload of short PUCCH-basedCSI reporting.

FIG. 10 illustrates an example information payload of long PUCCH-basedCSI reporting.

FIG. 11 is a flowchart illustrating operations of a UE performingchannel state information (CSI) reporting in a wireless communicationsystem to which a method proposed herein is applicable.

FIG. 12 is a flowchart illustrating operations of a base stationreceiving channel state information (CSI) reporting in a wirelesscommunication system to which a method proposed herein is applicable.

FIG. 13 is a block diagram illustrating a configuration of a wirelesscommunication device to which methods proposed herein are applicable.

FIG. 14 is a block diagram illustrating a configuration of acommunication device according to an embodiment of the disclosure.

FIG. 15 is a view illustrating an example RF module of a wirelesscommunication device to which a method proposed herein is applicable.

FIG. 16 is a view illustrating another example RF module of a wirelesscommunication device to which a method proposed herein is applicable.

DETAILED DESCRIPTION

Some embodiments of the present disclosure are described in detail withreference to the accompanying drawings. A detailed description to bedisclosed along with the accompanying drawings is intended to describesome exemplary embodiments of the present disclosure and is not intendedto describe a sole embodiment of the present disclosure. The followingdetailed description includes more details in order to provide fullunderstanding of the present disclosure. However, those skilled in theart will understand that the present disclosure may be implementedwithout such more details.

In some cases, in order to avoid making the concept of the presentdisclosure vague, known structures and devices are omitted or may beshown in a block diagram form based on the core functions of eachstructure and device.

In the present disclosure, a base station has the meaning of a terminalnode of a network over which the base station directly communicates witha terminal. In this document, a specific operation that is described tobe performed by a base station may be performed by an upper node of thebase station according to circumstances. That is, it is evident that ina network including a plurality of network nodes including a basestation, various operations performed for communication with a terminalmay be performed by the base station or other network nodes other thanthe base station. The base station (BS) may be substituted with anotherterm, such as a fixed station, a Node B, an eNB (evolved-NodeB), a basetransceiver system (BTS), an access point (AP), or generation NB(general NB, gNB). Furthermore, the terminal may be fixed or may havemobility and may be substituted with another term, such as userequipment (UE), a mobile station (MS), a user terminal (UT), a mobilesubscriber station (MSS), a subscriber station (SS), an advanced mobilestation (AMS), a wireless terminal (WT), a machine-type communication(MTC) device, a machine-to-Machine (M2M) device, or a device-to-device(D2D) device.

Hereinafter, downlink (DL) means communication from a base station toUE, and uplink (UL) means communication from UE to a base station. InDL, a transmitter may be part of a base station, and a receiver may bepart of UE. In UL, a transmitter may be part of UE, and a receiver maybe part of a base station.

Specific terms used in the following description have been provided tohelp understanding of the present disclosure, and the use of suchspecific terms may be changed in various forms without departing fromthe technical sprit of the present disclosure.

The following technologies may be used in a variety of wirelesscommunication systems, such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and non-orthogonalmultiple access (NOMA). CDMA may be implemented using a radiotechnology, such as universal terrestrial radio access (UTRA) orCDMA2000. TDMA may be implemented using a radio technology, such asglobal system for mobile communications (GSM)/general packet radioservice (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA maybe implemented using a radio technology, such as Institute of electricaland electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX),IEEE 802.20, or evolved UTRA (E-UTRA). UTRA is part of a universalmobile telecommunications system (UMTS). 3rd generation partnershipproject (3GPP) Long term evolution (LTE) is part of an evolved UMTS(E-UMTS) using evolved UMTS terrestrial radio access (E-UTRA), and itadopts OFDMA in downlink and adopts SC-FDMA in uplink. LTE-advanced(LTE-A) is the evolution of 3GPP LTE.

Embodiments of the present disclosure may be supported by the standarddocuments disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, thatis, radio access systems. That is, steps or portions that belong to theembodiments of the present disclosure and that are not described inorder to clearly expose the technical spirit of the present disclosuremay be supported by the documents. Furthermore, all terms disclosed inthis document may be described by the standard documents.

In order to more clarify a description, 3GPP LTE/LTE-A/New RAT (NR) ischiefly described, but the technical characteristics of the presentdisclosure are not limited thereto.

As propagation of smart phones and Internet of things (IoT) terminalsrapidly spreads, the amount of information which is transmitted andreceived through a communication network increases. Accordingly, in thenext generation wireless access technology, an environment (e.g.,enhanced mobile broadband communication) that provides a faster serviceto more users than existing communication systems (or existing radioaccess technology) needs to be considered.

To this end, a design of a communication system that considers machinetype communication (MTC) providing a service by connecting multipledevices and objects is discussed. Further, a design of a communicationsystem (e.g., Ultra-Reliable and Low Latency Communication (URLLC))considering a service and/or a user equipment sensitive to reliabilityand/or latency of communication is also discussed.

Hereinafter, in this specification, for easy description, thenext-generation wireless access technology is referred to as a new radioaccess technology (RAT) (NR) radio access technology and the wirelesscommunication system to which the NR is applied is referred to as an NRsystem.

Definition of Terms

eLTE eNB: An eLTE eNB is an evolution of an eNB that supports aconnection for an EPC and an NGC.

gNB: A node for supporting NR in addition to a connection with an NGC

New RAN: A radio access network that supports NR or E-UTRA or interactswith an NGC

Network slice: A network slice is a network defined by an operator so asto provide a solution optimized for a specific market scenario thatrequires a specific requirement together with an inter-terminal range.

Network function: A network function is a logical node in a networkinfra that has a well-defined external interface and a well-definedfunctional operation.

NG-C: A control plane interface used for NG2 reference point between newRAN and an NGC

NG-U: A user plane interface used for NG3 reference point between newRAN and an NGC

Non-standalone NR: A deployment configuration in which a gNB requires anLTE eNB as an anchor for a control plane connection to an EPC orrequires an eLTE eNB as an anchor for a control plane connection to anNGC

Non-standalone E-UTRA: A deployment configuration an eLTE eNB requires agNB as an anchor for a control plane connection to an NGC.

User Plane Gateway: A Terminal Point of NG-U Interface

General System

FIG. 1 is a diagram illustrating an example of an overall structure of anew radio (NR) system to which a method proposed by the presentdisclosure may be implemented.

Referring to FIG. 1, an NG-RAN is composed of gNBs that provide an NG-RAuser plane (new AS sublayer/PDCP/RLC/MAC/PHY) and a control plane (RRC)protocol terminal for a UE (User Equipment).

The gNBs are connected to each other via an Xn interface.

The gNBs are also connected to an NGC via an NG interface.

More specifically, the gNBs are connected to a Access and MobilityManagement Function (AMF) via an N2 interface and a User Plane Function(UPF) via an N3 interface.

New Rat (NR) Numerology and Frame Structure

In the NR system, multiple numerologies may be supported. Thenumerologies may be defined by subcarrier spacing and a CP (CyclicPrefix) overhead. Spacing between the plurality of subcarriers may bederived by scaling basic subcarrier spacing into an integer N (or μ). Inaddition, although a very low subcarrier spacing is assumed not to beused at a very high subcarrier frequency, a numerology to be used may beselected independent of a frequency band.

In addition, in the NR system, a variety of frame structures accordingto the multiple numerologies may be supported.

Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM)numerology and a frame structure, which may be considered in the NRsystem, will be described.

A plurality of OFDM numerologies supported in the NR system may bedefined as in Table 1.

TABLE 1 μ Δf = 2^(μ) · 15[kHz] Cyclic prefix 0 15 Normal 1 30 Normal 260 Normal, Extended 3 120 Normal 4 240 Normal

Regarding a frame structure in the NR system, a size of various fieldsin the time domain is expressed as a multiple of a time unit ofT_(s)=1/(Δf_(max)·N_(f)). In this case, Δf_(max)=480·10³, andN_(f)==4096 DL and UL transmission is configured as a radio frame havingsection of T_(f)=(Δf_(max)N_(f)/100)·T_(s)=10 ms. The radio frame iscomposed of ten subframes each having a section ofT_(sf)=(Δf_(max)N_(f)/1000)·T_(s)=1 ms.

In this case, there may be a set of UL frames and a set of DL frames.

FIG. 2 illustrates a relationship between a UL frame and a DL frame in awireless communication system to which a method proposed by the presentdisclosure may be implemented.

As illustrated in FIG. 2, a UL frame number I from a User Equipment (UE)needs to be transmitted T_(TA)=N_(TA)T_(s) before the start of acorresponding DL frame in the UE.

Regarding the numerology μ, slots are numbered in ascending order ofn_(s) ^(μ)∈{0, . . . , N_(subframe) ^(slots,μ)−1} in a subframe, and inascending order of n_(s,f) ^(μ)∈{0, . . . , N_(frame) ^(slots,μ)−1} in aradio frame. One slot is composed of continuous OFDM symbols of N_(symb)^(μ), and N_(symb) ^(μ) is determined depending on a numerology in useand slot configuration. The start of slots n_(s) ^(μ) in a subframe istemporally aligned with the start of OFDM symbols n_(s) ^(μ)N_(symb)^(μ) in the same subframe.

Not all UEs are able to transmit and receive at the same time, and thismeans that not all OFDM symbols in a DL slot or an UL slot are availableto be used.

Table 2 shows the number (N_(symb) ^(slot)) of OFDM symbols per slot,the number (N_(slot) ^(frame,μ)) of slots per radio frame, and thenumber (N_(slot) ^(subframe,μ)) of slots per subframe in normal CP, andTable 3 shows the number of OFDM symbols per slot, the number of slotsper radio frame, and the number of slots per subframe in extended CP.

TABLE 2 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

TABLE 3 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)2 12 40 4

FIG. 3 illustrates an example frame structure in an NR system. FIG. 3 isintended merely for illustration purposes but not for limiting the scopeof the disclosure.

Table 3 represents an example where μ=2, i.e., the subcarrier spacing(SCS) is 60 kHz. Referring to Table 2, one subframe (or frame) mayinclude four slots. The “1 subframe={1, 2, 4} slots” in FIG. 3 is anexample, and the number of slots that may be included in one subframemay be defined as shown in Table 2.

The mini-slot may consist of 2, 4, or 7 symbols or more or less symbols.

Regarding physical resources in the NR system, an antenna port, aresource grid, a resource element, a resource block, a carrier part,etc. may be considered.

Hereinafter, the above physical resources possible to be considered inthe NR system will be described in more detail.

First, regarding an antenna port, the antenna port is defined such thata channel over which a symbol on one antenna port is transmitted can beinferred from another channel over which a symbol on the same antennaport is transmitted. When large-scale properties of a channel receivedover which a symbol on one antenna port can be inferred from anotherchannel over which a symbol on another antenna port is transmitted, thetwo antenna ports may be in a QC/QCL (quasi co-located or quasico-location) relationship. Herein, the large-scale properties mayinclude at least one of delay spread, Doppler spread, Frequency shift,average received power, and Received Timing.

FIG. 4 illustrates an example of a resource grid supported in a wirelesscommunication system to which a method proposed by the presentdisclosure may be implemented.

Referring to FIG. 4, a resource grid is composed of N_(RB) ^(μ)N_(sc)^(RB) subcarriers in a frequency domain, each subframe composed of 14·2μOFDM symbols, but the present disclosure is not limited thereto.

In the NR system, a transmitted signal is described by one or moreresource grids, composed of N_(RB) ^(μ)N_(sc) ^(RB) subcarriers, and2^(μ)N_(symb) ^((μ)) OFDM symbols Herein, N_(RB) ^(μ)≤N_(RB) ^(max,μ).The above N_(RB) ^(max,μ) indicates the maximum transmission bandwidth,and it may change not just between numerologies, but between UL and DL.

In this case, as illustrated in FIG. 5, one resource grid may beconfigured for the numerology μ and an antenna port p.

FIG. 5 illustrates examples of resource grids for each antenna port andnumerology to which a method proposed in this specification may beapplied.

Each element of the resource grid for the numerology μ and the antennaport p is indicated as a resource element, and may be uniquelyidentified by an index pair (k, l). Herein, k=0, . . . , N_(RB)^(μ)N_(sc) ^(RB)−1 is an index in the frequency domain, and l=0, . . . ,2^(μ)N_(symb) ^((μ))−1 indicates a location of a symbol in a subframe.To indicate a resource element in a slot, the index pair (k, l) is used.Herein, l=0, . . . , N_(symb) ^(μ)−1.

The resource element (k,l) for the numerology μ and the antenna port pcorresponds to a complex value a_(k,l) ^((p,μ)). When there is no riskof confusion or when a specific antenna port or numerology is specified,the indexes p and μ may be dropped and thereby the complex value maybecome a_(k,l) ^((p)) or a_(k,l) .

The physical resource block is defined with N_(sc) ^(RB)=12 consecutivesubcarriers in the frequency domain.

Point A plays a role as a common reference point of the resource blockgrid and may be obtained as follows.

-   -   offsetToPointA for PCell downlink refers to the frequency offset        between point A and the lowest subcarrier of the lowest resource        block overlapping the SS/PBCH block used by the UE for initial        cell selection and is represented with resource block units        assuming a subcarrier interval of 15 kHz for FR1 and a        subcarrier interval of 60 kHz for FR2;    -   absoluteFrequencyPointA refers to the frequency-position of        point A expressed as in the absolute radio-frequency channel        number (ARFCN).

The common resource blocks are numbered up from zero in the frequencydomain for subcarrier spacing configuration μ.

The center of subcarrier 0 of common resource block 0 for subcarrierspacing configuration μ matches ‘point A.’ In the frequency domain,resource elements (k,l) for common resource block number n_(CRB) ^(μ)and subcarrier spacing configuration μ may be given as Equation 1 below.

$\begin{matrix}{n_{CRB}^{\mu} = \left\lfloor \frac{k}{N_{sc}^{RB}} \right\rfloor} & {{Equation}\mspace{14mu} 1}\end{matrix}$

Here, k may be defined relative to point A so that k=0 corresponds tothe subcarrier with point A centered. The physical resource blocks arenumbered from 0 to N_(BWP,i) ^(size)−1 in the bandwidth part (BWP), andi is the number of the BWP. In BWP i, the relationship between physicalresource block n_(PRB) and common resource block n_(CRB) may be given asEquation 2 below.n _(CRB) =n _(PRB) +N _(BWP,i) ^(start)  Equation 2

Here, N_(BWP,i) ^(start) may be common resource blocks in which the BWPstarts relative to common resource block 0.

Self-Contained Structure

A time division duplexing (TDD) structure considered in the NR system isa structure in which both uplink (UL) and downlink (DL) are processed inone slot (or subframe). This is to minimize the latency of datatransmission in the TDD system and the structure may be referred to as aself-contained structure or a self-contained slot.

FIG. 6 illustrates one example of a self-contained structure to whichthe method proposed in this specification may be applied. FIG. 5 is justfor convenience of the description and does not limit the scope of thepresent disclosure.

Referring to FIG. 6, it is assumed that one transmission unit (e.g.,slot or subframe) is constituted by 14 orthogonal frequency divisionmultiplexing (OFDM) symbols as in legacy LTE.

In FIG. 6, a region 602 refers to a downlink control region and a region604 refers to an uplink control region. Further, a region (that is, aregion without a separate indication) other than the regions 602 and 604may be used for transmitting downlink data or uplink data.

That is, uplink control information and downlink control information maybe transmitted in one self-contained slot. On the contrary, in the caseof data, the uplink data or downlink data may be transmitted in oneself-contained slot.

When the structure illustrated in FIG. 6 is used, in one self-containedslot, downlink transmission and uplink transmission may sequentiallyproceed and transmission of the downlink data and reception of uplinkACK/NACK may be performed.

Consequently, when an error of data transmission occurs, a time requiredfor retransmitting data may be reduced. Therefore, latency associatedwith data delivery may be minimized.

In the self-contained slot structure illustrated in FIG. 6, a time gapfor a process of switching from a transmission mode to a reception modein a base station (eNodeB, eNB, or gNB) and/or a terminal (userequipment (UE)) or a process of switching from the reception mode to thetransmission mode is required. In association with the time gap, whenthe uplink transmission is performed after the downlink transmission inthe self-contained slot, some OFDM symbol(s) may be configured as aguard period (GP).

Analog Beamforming

In a millimeter wave (mmWave, mmW) communication system, as thewavelength of the signal becomes shorter, multiple (or multiplex)antennas may be installed in the same area. For example, in a 30 CHzband, the wavelength is approximately 1 cm, and when antennas areinstalled at an interval of 0.5 lambda in a panel of 5 cm×5 cm accordingto a two-dimensional arrangement form, a total of 100 antenna elementsmay be installed.

Accordingly, in the mmW communication system, a method for increasingcoverage or increasing the throughput by increasing a beamforming (BF)gain using multiple antenna elements or increasing a throughput may beconsidered.

In this case, when a transceiver unit (TXRU) is installed so as toadjust transmission power or a phase for each antenna element,independent beamforming is possible for each frequency resource.

However, a method for installing the TXRU in all antenna elements (e.g.,100 antenna elements) may be ineffective in terms of cost. As a result,a method for mapping multiple antenna elements to one TXRU andcontrolling a direction of a beam by using an analog phase shifter maybe considered.

The aforementioned analog beamforming method may generate only one beamdirection in all bands, so that a frequency selective beam operation maynot be performed.

As a result, hybrid beamforming with B TXRUs that are fewer than Qantenna elements, in the form of an intermediate form of digitalbeamforming and analog beamforming, may be considered. In this case,although there is a difference depending on a connection method of BTXRUs and Q antenna elements, the number of directions of the beams thatmay be transmitted at the same time is limited to B or less.

Channel State Information (CSI)-Related Procedure

In the new radio (NR) system, a channel state information-referencesignal (CSI-RS) is used for time/frequency tracking, CSI computation,layer 1 (L1)-reference signal received power (RSRP) computation, ormobility

Throughout the present disclosure, “A and/or B” may be interpreted asthe same as “including at least one of A or B”.

The CSI computation is related to CSI acquisition, and L1-RSRPcomputation is related to beam management (BM).

The CSI indicates all types of information indicative of a quality of aradio channel (or link) formed between a UE and an antenna port.

Hereinafter, operation of a UE with respect to the CSI-related procedurewill be described.

FIG. 7 is a flowchart illustrating an example of a CSI-relatedprocedure.

To perform one of the above purposes of a CSI-RS, a terminal (e.g., aUE) receives CSI related configuration information from a base station(e.g., a general node B (gNB)) through a radio resource control (RRC)signaling (S710).

The CSI-related configuration information may include at least one ofCSI interference management (IM) resource-related information, CSImeasurement configuration-related information, CSI resourceconfiguration-related information, CSI-RS resource-related information,or CSI reporting configuration-related information.

The CSIIM resource-related information may include CSI-IM resourceinformation, CSI-IM resource set information, etc.

The CSI-IM resource set is identified by a CSI-IM resource set ID(identifier), and one resource set includes at least one CSI-IMresource.

Each CSI-IM resource is identified by a CSI-IM resource ID.

The CSI resource configuration-related information defines a groupincluding at least one of a non-zero power (NZP) CSI-RS resource set, aCSI-IM resource set, or a CSI-SSB resource set.

That is, the CSI resource configuration-related information includes aCSI-RS resource set list, and the CSI-RS resource set list may includeat least one of a NZP CSI-RS resource set list, a CSI-IM resource setlist, or a CSI-SSB resource set list.

The CSI resource configuration-related information may be expressed asCSI-REsourceConfig IE.

The CSI-RS resource set is identified by a CSI-RS resource set ID, andone resource set includes at least one CSI-RS resource.

Each CSI-RS resource is identified by a CSI-RS resource ID.

As shown in Table 4, parameters (e.g.: the BM-related parameterrepetition, and the tracking-related parameter trs-Info indicative of(or indicating) a purpose of a CSI-RS may be set for each NZP CSI-RSresource set.

Table 4 shows an example of NZP CSI-RS resource set IE.

TABLE 4 -- ASN1START -- TAG-NZP-CSI-RS-RESOURCESET-STARTNZP-CSI-RS-ResourceSet ::= SEQUENCE { nzp-CSI-ResourceSetIdNZP-CSI-RS-ResourceSetId, nzp-CSI-RS-Resources SEQUENCE (SIZE(1..maxNrofNZP-CSI-RS- ResourcesPerSet)) OF NZP-CSI-RS-ResourceId,repetition ENUMERATED { on, off } OPTIONAL, aperiodicTriggeringOffsetINTEGER(0..4) OPTIONAL, -- Need S trs-Info ENUMERATED {true}  OPTIONAL,-- Need R ... } -- TAG-NZP-CSI-RS-RESOURCESET-STOP -- ASN1STOP

In Table 4, the parameter repetition is a parameter indicative ofwhether to repeatedly transmit the same beam, and indicates whetherrepetition is set to “ON” or “OFF” for each NZP CSI-RS resource set.

The term “transmission (Tx) beam” used in the present disclosure may beinterpreted as the same as a spatial domain transmission filter, and theterm “reception (Rx) beam” used in the present disclosure may beinterpreted as the same as a spatial domain reception filter.

For example, when the parameter repetition in Table 4 is set to “OFF”, aUE does not assume that a NZP CSI-RS resource(s) in a resource set istransmitted to the same DL spatial domain transmission filter and thesame Nrofports in all symbols.

In addition, the parameter repetition corresponding to a higher layerparameter corresponds to “CSI-RS-ResourceRep” of L1 parameter.

The CSI reporting configuration related information includes theparameter reportConfigType indicative of a time domain behavior and theparameter reportQuantity indicative of a CSI-related quantity to bereported.

The time domain behavior may be periodic, aperiodic, or semi-persistent.

In addition, the CSI reporting configuration-related information may berepresented as CSI-ReportConfig IE, and Table 5 shows an example of theCSI-ReportConfig IE.

TABLE 5 -- ASN1START -- TAG-CSI-RESOURCECONFIG-START CSI-ReportConfig::= SEQUENCE { reportConfigId CSI-ReportConfigId, carrier ServCellIndexOPTIONAL, -- Need S resourcesForChannelMeasurement CSI-ResourceConfigId,csi-IM-ResourcesForInterference CSI-ResourceConfigId OPTIONAL, -- Need Rnzp-CSI-RS-ResourcesForInterference CSI-ResourceConfigId OPTIONAL, --Need R reportConfigType CHOICE { periodic SEQUENCE { reportSlotConfigCSI- ReportPeriodicityAndOffset, pucch-CSI-ResourceList SEQUENCE (SIZE(1..maxNrofBWPs)) OF PUCCH-CSI-Resource }, semiPersistentOnPUCCHSEQUENCE { reportSlotConfig CSI- ReportPeriodicityAndOffset,pucch-CSI-ResourceList SEQUENCE (SIZE (1..maxNrofBWPs)) OFPUCCH-CSI-Resource }, semiPersistentOnPUSCH SEQUENCE { reportSlotConfigENUMERATED {sl5, sl10, sl20, sl40, sl80, sl160, sl320},reportSlotOffsetList SEQUENCE (SIZE (1.. maxNrofUL- Allocations)) OFINTEGER(0..32), p0alpha P0-PUSCH-AlphaSetId }, aperiodic SEQUENCE {reportSlotOffsetList SEQUENCE (SIZE (1..maxNrofUL- Allocations)) OFINTEGER(0..32) } }, reportQuantity CHOICE { none NULL, cri-RI-PMI-CQINULL, cri-RI-i1 NULL, cri-RI-i1-CQI SEQUENCE { pdsch-BundleSizeForCSIENUMERATED {n2, n4} OPTIONAL }, cri-RI-CQI NULL, cri-RSRP NULL,ssb-Index-RSRP NULL, cri-RI-LI-PMI-CQI NULL },

In addition, the UE measures CSI based on configuration informationrelated to the CSI (S720).

Measuring the CSI may include (1) receiving a CSI-RS by the UE (S721)and (2) computing CSI based on the received CSI-RS (S722).

A sequence for the CSI-RS is generated by Equation 3, and aninitialization value of a pseudo-random sequence C(i) is defined byEquation 4.

$\begin{matrix}{{r(m)} = {{\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {2m} \right)}}} \right)} + {j\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {{2m} + 1} \right)}}} \right)}}} & {{Equation}\mspace{14mu} 3}\end{matrix}$c _(init)=(2¹⁰(N _(symb) ^(slot) n _(s,f) ^(μ) +l+1)(2n _(ID)+1)+n_(ID))mod 2³¹  Equation 4

In Equations 3 and 4, n_(s,f) ^(μ) is a slot number within a radioframe, and a pseudo-random sequence generator is initialized with Cintat the start of each OFDM symbol where n_(s,f) ^(μ) is the slot numberwithin a radio frame.

In addition, l indicates an OFDM symbol number in a slot, and n_(ID)indicates higher-layer parameter scramblingID.

In addition, regarding the CSI-RS, resource element (RE) mapping ofCSI-RS resources of the CSI-RS is performed in time and frequencydomains by higher layer parameter CSI-RS-ResourceMapping.

Table 6 shows an example of CSI-RS-ResourceMapping IE.

TABLE 6 -- ASN1START -- TAG-CSI-RS-RESOURCEMAPPING-STARTCSI-RS-ResourceMapping ::= SEQUENCE { frequencyDomainAllocation CHOICE {row1 BIT STRING (SIZE (4)), row2 BIT STRING (SIZE (12)), row4 BIT STRING(SIZE (3)), other BIT STRING (SIZE (6)) }, nrofPorts ENUMERATED{p1,p2,p4,p8,p12,p16,p24,p32}, firstOFDMSymbolInTimeDomain INTEGER(0..13), firstOFDMSymbolInTimeDomain2 INTEGER (2..12) OPTIONAL, -- NeedR cdm-Type ENUMERATED {noCDM, fd-CDM2, cdm4-FD2-TD2, cdm8-FD2-TD4},density CHOICE { dot5 ENUMERATED (evenPRBs, oddPRBs}, one NULL, threeNULL, spare NULL }, freqBand CSI-FrequencyOccupation, ... }

In Table 6, a density (D) indicates a density of CSI-RS resourcesmeasured in a RE/port/physical resource block (PRB), and nrofPortsindicates the number of antenna ports.

In addition, the UE reports the measured CSI to the base station (S730).

Herein, when a quantity of CSI-ReportConfig in Table 6 is set to “none(or No report)”, the UE may skip the reporting.

However, even when the quantity is set to “none (or No report)”, the UEmay report the measured CSI to the base station.

The case where the quantity is set to “none” is t when an aperiodic TRSis triggered or when repetition is set.

Herein, it may be defined such that reporting by the UE is omitted onlywhen repetition is set to “ON”.

To put it briefly, when repetition is set to “ON” and “OFF”, a CSIreport may indicate any one of “No report”, “SSB Resource Indicator(SSBRI) and L1-RSRP”, and “CSI-RS Resource Indicator (CRI) and L1-RSRP”.

Alternatively, it may be defined to transmit a CSI report indicative of“SSBRI and L1-RSRP” or “CRI and L1-RSRP” when repetition is set to“OFF”, it may be defined such that, and to transmit a CSI reportindicative of “No report”, “SSBRI and L1-RSRP”, or “CRI and L1-RSRP”when repetition is “ON”.

CSI Measurement and Reporting Procedure

The NR system supports more flexible and dynamic CSI measurement andreporting.

The CSI measurement may include receiving a CSI-RS, and acquiring CSI bycomputing the received CSI-RS.

As time domain behaviors of CSI measurement and reporting,aperiodic/semi-persistent/periodic channel measurement (CM) andinterference measurement (IM) are supported.

To configure CSI-IM, four port NZP CSI-RS RE patterns are used.

CSI-IM-based IMR of NR has a design similar to CSI-IM of LTE and isconfigured independent of ZP CSI-RS resources for PDSCH rate matching.

In addition, each port in the NZP CSI-RS-based IMR emulates aninterference layer having (a desirable channel and) a pre-coded NZPCSI-RS.

This is about intra-cell interference measurement of a multi-user case,and it primarily targets MU interference.

At each port of the configured NZP CSI-RS-based IMR, the base stationtransmits the pre-coded NZP CSI-RS to the UE.

The UE assumes a channel/interference layer for each port in a resourceset, and measures interference.

If there is no PMI or RI feedback for a channel, a plurality ofresources are configured in a set and the base station or networkindicates, through DCI, a subset of NZP CSI-RS resources forchannel/interference measurement.

Resource setting and resource setting configuration will be described inmore detail.

Resource Setting

Each CSI resource setting “CSI-ResourceConfig” includes configuration ofS≤1 CSI resource set (which is given by higher layer parameter“csi-RS-ResourceSetList”).

Herein, a CSI resource setting corresponds to CSI-RS-resourcesetlist.

Herein, S represents the number of configured CSI-RS resource sets.

Herein, configuration of S≤1 CSI resource set includes each CSI resourceset including CSI-RS resources (composed of NZP CSI-RS or CSI-IM), and aSS/PBCH block (SSB) resource used for L1-RSRP computation.

Each CSI resource setting is positioned at a DL bandwidth part (BWP)identified by higher layer parameter bwp-id.

In addition, all CSI resource settings linked to a CSI reporting settinghave the same DL BWP.

In a CSI resource setting included in CSI-ResourceConfig IE, a timedomain behavior of a CSI-RS resource may be indicated by higher layerparameter resourceType and may be configured to be aperiodic, periodic,or semi-persistent.

The number S of CSI-RS resource sets configured for periodic andsemi-persistent CSI resource settings is restricted to “1”.

Aperiodicity and a slot offset configured for periodic andsemi-persistent CSI resource settings are given from a numerology ofrelated DL BWP, just like being given by bwp-id.

When the UE is configured with a plurality of CSI-ResourceConfigincluding the same NZP CSI-RS resource ID, the same time domain behavioris configured for the CSI-ResourceConfig.

When the UE is configured with a plurality of CSI-ResourceConfig havingthe same CSI-IM resource ID, the same time domain behavior is configuredfor the CSI-ResourceConfig.

Then, one or more CSI resource settings for channel measurement (CM) andinterference measurement (IM) are configured through higher layersignaling.

-   -   A CSI-IM resource for interference measurement.    -   An NZP CSI-RS resource for interference measurement.    -   An NZP CSI-RS resource for channel measurement.

That is, a channel measurement resource (CMR) may be an NZP CSI-RS forCSI acquisition, and an interference measurement resource (IMR) may bean NZP CSI-RS for CSI-IM and for IM.

Herein, CSI-IM (or a ZP CSI-RS for IM) is primarily used for inter-cellinterference measurement.

In addition, an NZP CSI-RS for IM is primarily used for intra-cellinterference measurement from multi-user.

The UE may assume that a CSI-RS resource(s) and a CSI-IM/NZP CSI-RSresource(s) for interference measurement configured for one CSIreporting is “QCL-TypeD” for each resource.

Resource Setting Configuration

As described above, a resource setting may represent a resource setlist.

Regarding aperiodic CSI, each trigger state configured using higherlayer parameter “CSI-AperiodicTriggerState” is that eachCSI-ReportConfig is associated with one or multiple CSI-ReportConFIGlinked to a periodic, semi-persistent, or aperiodic resource setting.

One reporting setting may be connected to three resource settings atmaximum.

-   -   When one resource setting is configured, a resource setting        (given by higher layer parameter resourcesForChannelMeasurement)        is about channel measurement for L1-RSRP computation.    -   When two resource settings are configured, the first resource        setting (given by higher layer parameter        resourcesForChannelMeasurement) is for channel measurement and        the second resource setting (given by        csi-IM-ResourcesForInterference or        nzp-CSI-RS-ResourcesForInterference) is for CSI-IM or for        interference measurement performed on an NZP CSI-RS.    -   When three resource settings are configured, the first resource        setting (given by resourcesForChannelMeasurement) is for channel        measurement, the second resource setting (given by        csi-IM-ResourcesForInterference) is for CSI-IM based        interference measurement, and the third resource setting (given        by nzp-CSI-RS-ResourcesForInterference) is for NZP CSI-RS based        interference measurement.

Regarding semi-persistent or periodic CSI, each CSI-ReportConfig islinked to a periodic or semi-persistent resource setting.

-   -   When one resource setting (given by        resourcesForChannelMeasurement) is configured, the resource        setting is about channel measurement for L1-RSRP computation.    -   When two resource settings are configured, the first resource        setting (given by resourcesForChannelMeasurement) is for channel        measurement, and the second resource setting (given by tge        higher layer parameter “csi-IM-ResourcesForInterference”) is        used for interference measurement performed on CSI-IM.

CSI computation regarding CSI measurement will be described in moredetail.

If interference measurement is performed on CSI-IM, each CSI-RS resourcefor channel measurement is associated with a CSI-RS resource in acorresponding resource set by an order of CSI-RS resources and CSI-IMresources.

The number of CSI-RS resources for channel measurement is the same asthe number of CSI-IM resources.

In addition, when interference measurement is performed on an NZPCSI-RS, the UE is not expected to be configured with one or more NZPCSI-RS resources in an associated resource set within a resource settingfor channel measurement.

A UE configured with higher layer parameternzp-CSI-RS-ResourcesForInterference is not expected to be configuredwith 18 or more NZP CSI-RS ports in a NZP CSI-RS resource set.

For CSI measurement, the UE assumes the following.

-   -   Each NZP CSI-RS port configured for interference measurement        corresponds to an interference transmission layer.    -   Every interference transmission layer of NZP CSI-RS ports for        interference measurement considers an energy per resource        element (EPRE) ratio.    -   A different interference signal on a RE(s) of an NZP CSI-RS        resource for channel measurement, an NZP CSI-RS resource for        interference measurement, or a CSI-IM resource for interference        measurement.

A CSI reporting procedure will be described in more detail.

For CSI reporting, time and frequency resources available for an UE arecontrolled by a base station.

CSI may include at least one of channel quality indicator (CQI), aprecoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), amSS/PBCH block resource indicator (SSBRI), a layer indicator (LI), a rankindicator (RI), or L1-RSRP.

Regarding the CQI, the PMI, the CRI, the SSBRI, the LI, the RI, and theL1-RSRP, the UE may be configured with N≤1 CSI-ReportConfig reportingsetting, M≤1 CSI-ResourceConfig resource setting, and a list of one ortwo trigger states (provided by aperiodicTriggerStateList andsemiPersistentOnPUSCH-TriggerStateList) by a higher layer.

In the aperiodicTriggerStateList, each trigger state includes a channeland a list of associated CSI-ReportConfigs selectively indicative ofResource set IDs for interference.

In the semiPersistentOnPUSCH-TriggerStateList, each trigger stateincludes one associated CSI-ReportConfig.

In addition, a time domain behavior of CSI reporting supports periodic,semi-persistent, and aperiodic CSI reporting.

Hereinafter, periodic, semi-persistent, and aperiodic CSI reporting willbe described.

The periodic CSI presorting is performed on a short PUCCH and a longPUCCH.

Aperiodicity and a slot offset of the periodic CSI reporting may beconfigured by RRC and refer to CSI-ReportConfig IE.

Then, SP CSI reporting is performed on a short PUCCH, a long PUCCH, or aPUSCH.

In the case of SP CSI on a short/long PUCCH, a periodicity and a slotoffset are configured by RRC, and CSI reporting to an additional MAC CEis activated/deactivated

In the case of SP CSI on a PUSCH, a periodicity of SP CSI reporting isconfigured by RRC, but a slot offset thereof is not configured by RRCand SP CSI reporting is activated/deactivated by DCI (format 0_1).

The first CSI reporting timing follows a PUSCH time domain allocationvalue indicated by DCI, and subsequent CSI reporting timing follows aperiodicity which is configured by RRC.

For SP CSI reporting on a PUSCH, a separated RNTI (SP-CSI C-RNTI) isused.

DCI format 0_1 may include a CSI request field and activate/deactivate aspecific configured SP-CSI trigger state.

In addition, SP CSI reporting is activated/deactivated identically orsimilarly to a mechanism having data transmission on a SPS PUSCH.

Next, aperiodic CSI reporting is performed on a PUSCH and triggered byDCI.

In the case of AP CSI having an AP CSI-RS, an AP CSI-RS timing isconfigured by RRC.

Herein, a timing of AP CSI reporting is dynamically controlled by DCI.

A reporting method (e.g., transmitting in order of RI, WB, PMI/CQI, andSB PMI/CQI) by which CSI is divided and reported in a plurality ofreporting instances, the method which is applied for PUCCH-based CSIreporting in LTE, is not applied in NR.

Instead, NR restricts configuring specific CSI reporting on a short/longPUCCH, and a CSI omission rule is defined.

Regarding an AP CSI reporting timing, PUSCH symbol/slot location isdynamically indicated by DCI. In addition, candidate slot offsets areconfigured by RRC.

Regarding CSI reporting, a slot offset (Y) is configured for eachreporting setting.

Regarding UL-SCH, a slot offset K2 is configured separately.

Two CSI latency classes (low latency class and high latency class) aredefined in terms of CSI computation complexity.

The low latency CSI is WB CSI that includes up to 4-ports Type-Icodebook or up to 4-ports non-PMI feedback CSI.

The high latency CSI is a CSI other than the low latency CSI.

Regarding a normal UE, (Z, Z′) is defined in a unit of OFDM symbols.

Z represents the minimum CSI processing time after receiving CSItriggering DCI and before performing CSI reporting.

Z′ represents the minimum CSI processing time after receiving CSI-RSabout a channel/interference and before performing CSI reporting

Additionally, the UE reports the number of CSI which can be calculatedat the same time.

CSI Reporting Using PUSCH

FIG. 8 shows an example of information payload of PUSCH-based CSIreporting.

NZBI is a parameter representing an indication of the number of non-zerowideband amplitude coefficients for each layer in Type II PMI code book.

When DCI is decoded, a UE performs aperiodic CSI reporting using a PUSCHof a serving cell c.

The aperiodic CSI reporting performed on the PUSCH supports wideband andsub-band frequency granularity.

The aperiodic CSI reporting performed on the PUSCH supports Type I andType II CSI.

If DCI format 0_1, which activates a semi-persistent (SP) CSI triggerstate, is decoded, a UE performs SP CSI reporting on the PUSCH.

DCI format 0_1 includes a CSI request field indicative of an SP CSItrigger state to be activated or deactivated.

SP CSI reporting on the PUSCH supports Type I and Type II CSI havingwideband and sub-band frequency granularity.

A PUSCH resource and a Modulation and Coding Scheme (MCS) for SP CSIreporting are semi-persistently allocated by UL DCI.

CSI reporting for the PUSCH may be multiplexed with UL data on thePUSCH.

In addition, CSI reporting for the PUSCH may be performed without beingmultiplexed with UL data.

As illustrated in FIG. 16, regarding Type I and Type II CSI, CSIreporting on the PUSCH may include two parts (Part 1 and Part 2)illustrated in FIG. 16.

Part 1 (810) is used to identify the number of information bits of Part2 (820). Part 1 is entirely transmitted before Part 2.

-   -   Regarding Type I CSI feedback, Part 1 includes (when reported)        RI, (when reported) CRI, and CQI of the first codeword.    -   Part 2 includes a PMI, and, when RI>4, parts 2 includes a CQI.

Regarding Type II CSI feedback, Part 1 has a fixed payload size andincludes an RI, a CQI, and an indication (NZBI) indicative of the numberof non-zero wideband amplitude coefficients for each layer of Type IICSI.

In Part 1, the RI, the CQI, and the NZBI are encoded additionally.

Part 2 includes a PMI of Type II CSI.

Part 1 and Part 2 are additionally encoded.

A Type II CSI report transmitted on the PUSCH is calculated independentof every Type II CSI reporting transmitted on PUCCH format 1, 3, or 4.

If higher layer parameter reportQuantity is set to one of “cri-RSRP” or“ssb-Index-RSRP”, a CSI feedback is composed of a single Part.

Regarding Type I and Type II CSI reporting which are configured for aPUCCH but transmitted on a PUSCH, an encoding scheme follows an encodingscheme of the PUCCH.

If CSI reporting includes two parts in the PUSCH and a CSI payload issmaller than a payload size provided by a PUSCH resource allocated forCSI reporting, the UE may omit some of Part 2 CSI.

Omission of Part 2 CSI is determined by a priority order, and Priority 0is the highest priority and 2N_(rep) is the lowest priority.

CSI Reporting Using PUCCH

A UE is configured semi-statically by a higher layer in order to performperiodic CSI reporting on a PUCCH.

The UE may be configured by higher layers for multiple periodic CSIreports corresponding to one or more higher layer configured CSIreporting setting Indications, where the associated CSI MeasurementLinks and CSI Resource Settings are higher layer configured.

In PUCCH format 2, 3, or 4, periodic CSI reporting supports Type I CSIbased on a wide bandwidth.

Regarding SP CSI on a PUSCH, the UE performs SP CSI report on a PUCCHwhich has applied from a slot n+3N_(slot) ^(subframe,μ)+1 after HARQ-ACKcorresponding to a PDSCH carrying a selection command was transmittedfrom a slot n.

The selection command includes one or more report setting indicationswhere associated CSI resource settings are configured.

The SP CSI report supports Type I CSI on the PUCCH.

SP CSI report in PUCCH format 2 supports Type I CSI having a widebandwidth frequency granularity. SP CSI report in PUCCH format 3 or 4supports Type I sub-band CSI and Type II CSI having a wide bandwidthgranularity.

When the PUCCH carries Type I CSI having a wide bandwidth frequencygranularity, CSI payloads carried by PUCCH format 2 and PUCCH format 3or 4 are the same, irrespective of (when reported) RI, (when reported)CRI.

In PUCCH format 3 or 4, Type I CSI sub-band payload is divided into twoparts.

The first part (Part 1) includes (when reported) RI, (wen reported) CRI,and CQI of the first codeword.

The second part (Part 2) includes PMI, and, when RI>4, the second part(Part 2) includes CQI of the second codeword.

SP CSI reporting carried in PUCCH format 3 or 4 supports Type II CSIfeedback, but only Part 1 of Type II CSI feedback.

In PUCCH format 3 or 4 supporting Type II CSI feedback, CSI report maydepend on a UE capability.

Type II CSI report (only Part 1 thereof) carried in PUCCH format 3 or 4is computed independently of Type II CSI report carried in the PUSCH.

When the UE is configured with CSI reporting in PUCCH format 2, 3, or 4,each PUCCH resource is configured for each candidate UL BWP.

Where the UE receives active SP CSI reporting configuration in the PUCCHbut does not receive a deactivation command, when the BWP in which CSIreporting is performed is an active BWP, CSI reporting is performed and,otherwise, CSI reporting is temporarily stopped. The operation applieslikewise even in the case of CSI on PUCCH. If BWP switching occurs forPUSCH-based SP CSI reporting, the CSI reporting is appreciated asautomatically deactivated.

Table 7 shows an example of a PUCCH format

TABLE 7 Length in OFDM symbols PUCCH format N_(symb) ^(PUCCH) Number ofbits 0 1-2  ≥2 1 4-14 ≥2 2 1-2  >2 3 4-14 >2 4 4-14 >2

In Table 7, N_(symb) ^(PUCCH) indicates a length of PUCCH transmissionin an OFDM symbol.

In addition, depending on the length of PUCCH transmission, the PUCCHformat may be classified as a short PUCCH or a long PUCCH.

In Table 7, PUCCH format 0 and 2 may be called the short PUCCH, andPUCCH format 1, 3, and 4 may be called the long PUCCH.

Hereinafter, regarding PUCCH-based CSI reporting, short PUCCH-based CSIreporting and long PUCCH-based CSI reporting will be described in moredetail.

FIG. 9 shows an example of information payload of short PUCCH-based CSIreporting.

The short PUCCH-based CSI reporting is used only for wideband CSIreporting.

The short PUCCH-based CSI reporting has the same payload regardless ofan RI/CRI in a given slot (in order to avoid blind decoding).

A size of the information payload may be different between the maximumCSI-RS ports of a CSI-RS configured in a CSI-RS resource set.

When a payload including a PMI and a CQI are diversified to including anRI/CQI, padding bits are added to the RI/CRI/PMI/CQI before an encodingprocedure for equalizing a payload associated with different RI/CRIvalues.

In addition, the RI/CRI/PMI/CQI may be encoded with the padding bits,when necessary.

Next, long PUCCH-based CSI reporting will be described.

FIG. 10 shows an example of information payload of long PUCCH-based CSIreporting.

For wideband reporting, the long PUCCH-based CSI reporting may use thesame solution as that of the short PUCCH-based CSI reporting.

The long PUCCH-based CSI reporting has the same payload regardless of anRI/CRI.

For sub-band reporting, Two-part encoding (For Type I) is applied.

Part 1 (1010) may have a fixed payload according to the number of ports,a CSI type, RI restriction, and the like, and Part 2 (1020) may have avariety of payload sizes according to Part 1.

The CSI/RI may be first encoded to determine a payload of the PMI/CQI.

In addition, CQIi (i=1, 2) corresponds to a CQI for the i-th codeword(CW).

Regarding a long PUCCH, Type II CSI reporting may carry only Part 1.

Since the next-generation system (i.e., the NR system) uses moreantennas and wider bandwidth in the base station, the size of thechannel state information (CSI) the UE transmits to the base station mayincrease. In this case, transmission of CSI using the PUSCH as well asthe PUCCH may be efficient to effectively transmit larger CSI (i.e., CSIpayload). At this time, to transmit the CSI via the PUSCH, the basestation may allocate an uplink resource to the UE via the downlinkcontrol information (DCI) (e.g., the UL grant). The CSI transmission maybe performed periodically as necessary.

To perform periodic CSI reporting based on the PUSCH, it may bepreferable to allocate periodic PUSCH resources rather than periodicallytransmitting UL grants. Thus, there is a need for considering a methodfor allocating periodic PUSCHs for transmitting uplink controlinformation (UCI), such as CSI.

Hereinafter, according to the disclosure, there are proposed anassociation with a method and procedure of semi-persistent scheduling,which is a method for periodic PUSCH transmission and a method of usingthe same in the legacy system (e.g., LTE system) and/or next-generationsystem (e.g., NR system).

In other words, according to the disclosure, there is proposed a methodand procedure for setting a semi-persistent CSI configuration usingperiodic PUSCHs. However, it is apparent that the embodiments andmethods proposed herein may also apply to PUCCH-based semi-persistentCSI, aperiodic CSI, and/or periodic CSI. It is also obvious that theembodiments and/or methods proposed herein may apply to otherconfigurations (e.g., semi-persistent scheduling and configurations forgrant-free uplink transmission (i.e., grant-free scheduling) usingsimilar configuration methods and procedures.

As mentioned above, in the next-generation system (e.g., NR system), theUE may perform CSI measurement and/or reporting according to severalmeasurement link configurations by a combination of CSI measurementresource configurations (e.g., the above-described CSI resource setting)and reporting configurations (e.g., the above-described CSI reportingsetting). Further, aperiodic, semi-persistent, or periodic CSI reportingand/or retransmission of the reference signa may be supported. At thistime, semi-persistent reporting and aperiodic reporting may beconfigured to be supported via the PUSCH or PUCCH, and periodicreporting may be configured to be supported via the PUCCH.

Hereinafter, according to the disclosure, there are proposed specificmethods related to resource configuration upon transmission ofsemi-persistently configured CSI (i.e., upon semi-persistent CSItransmission) and apparatus for the same.

First described is a method of configuring, e.g., resource configurationand reporting configuration related to the semi-persistently configuredCSI. It is assumed below that there are set K measurement linkconfigurations for semi-persistent CSI.

At this time, the resource configuration (or resource setting) may beconfigured as in the following examples.

For example, where each semi-persistent CSI measurement is transmittedvia the PUSCH, PUSCH resource configuration may be performed separately.Such PUSCH resource configuration may be assumed to be configured in ascheme described below according to the disclosure. It may be assumed inthe configuration that where a dynamic slot format indicator (SFI) isconfigured, the UE performs reporting only when the reporting resourceis valid with the reference RS deemed valid according to the dynamicSFI. It may otherwise be assumed that the resource is valid according toconfiguration.

As another example, the semi-persistent scheduling (SPS) PUSCH resourcethat may be shared by semi-persistent CSI measurement may be configuredto be commonly shared. The period of the SPS PUSCH may be configured bythe network (e.g., the base station) and it may be assumed that onlywhen the SPS PUSCH resource or PUSCH is available in the period ofsemi-persistent reporting, the UE performs CSI reporting and, otherwise,the UE skips semi-persistent CSI reporting. Similarly, it may be assumedin the configuration that where a dynamic SFI is configured forreporting, the UE performs reporting only when the reporting resource isvalid with the reference RS deemed valid according to the dynamic SFI.It may otherwise be assumed that the resource is valid according toconfiguration. Sharing with one resource may mean that sharing with datais possible. In this case, the UE may be configured to transmit CSI viaaggregation of all overlapping semi-persistent reports or to select oneof them based on some priorities (e.g., based on CSI type I or II, BLERtarget, etc.) and transmit CSI via the selected one.

Further, where CSI reporting is skipped because the reference resourceis valid but the reporting resource is not, such reporting may consideradditional schemes as follows. In the disclosure, reference resource mayrefer to a resource used to transmit the reference signal from the basestation to the UE so as to determine and/or measure the channel state.As an example, the reference resource related to CSI reporting may meana resource in which the CSI-RS is allocated and transmitted.

First, where the reference resource is invalid upon the next reportingoccasion so that reporting needs to be skipped, the UE may be configuredto report a prior measurement that has not been reported before ratherthan skipping CSI reporting. Or, the UE may be configured to piggybackthe report to a valid PUSCH or PUCCH and transmit the same in thefuture.

Where the reference resource is invalid by, e.g., dynamic SFI, the UEmay be configured to report a previous value according to the networkconfiguration. In particular, where CSI is transmitted in the form ofSPS PUSCH, since such transmission may be used for the purpose ofchannel estimation instead of SRS, the UE may transmit the CSI if thereporting resource is valid although the reference resource is invalidso that CSI reporting is skipped (i.e., dropped). In this case, thetransmission may be to fill with the prior CSI value or zero. Or, wherethe reference resource is not valid due to missing group common (GC)PDCCH, at least if the reporting resource is valid, the UE may reportthe prior CSI value or transmit zero. Or, even in such a case, the UEmay be configured to always skip uplink transmission.

In the case of semi-persistent CSI, no drop occurs due to collision withother CSI. However, if a collision occurs, the following methods may betaken into account. In other words, if semi-persistent CSI reportingcollides with other channel and/or other reference signal, the followingschemes may apply.

First described are methods of processing collision when the UE isscheduled to perform CSI reporting via the PUCCH.

Specifically, where the UCI of the PUCCH is piggybacked to the PUSCH dueto collision with the PUSCH although the CSI is scheduled with thePUCCH, whether to piggyback the CSI may be determined depending on thebeta-offset value set by the network (e.g., the base station). In thiscase, the network, although coming up with no aperiodic CSI trigger, maydynamically indicate the beta-offset, allowing processing for piggybackto be processed. And/or, the beta-offset may be set to differ persemi-persistent CSI reporting configuration. Further, such processingmay also be carried out on periodic CSI reporting configuration.

It may also be assumed that the UE always transmit the CSI only with theconfigured resource in the case of semi-persistent CSI. Thus, upon PUSCHpiggyback, the CSI may be dropped.

Next described are methods of processing collision when the UE isscheduled to perform CSI reporting via the PUSCH.

Specifically, if the PUSCH-based CSI collides with other scheduledPUSCH, the UE may perform piggyback only when the PUSCH includes noaperiodic CSI. At this time, the beta-offset value may be processed in asimilar manner to the above-described scheme. Or, where the PUSCH-basedCSI collides with other scheduled PUSCH, the PSUCH for semi-persistentCSI may be dropped.

Unlike this, if the PUSCH-based CSI collides with other PUCCH, the PUCCHmay be dropped according to the CSI collision rule and, thereafter, ifthe CSI is not included but an HARQ-ACK is included, the UE may beconfigured to piggyback the HARQ-ACK upon PUSCH transmission. At thistime, where the UE does not support simultaneous transmission of thePUCCH and PUSCH, the semi-persistent CSI may be dropped. Further, wherethe PUSCH-based CSI collides with other PUCCH, if the PUCCH includes ascheduling request (SR), similar processing to the above-describedHARQ-ACK scheme may be performed or a method of joint-encoding the CSIand SR may be considered.

Unlike this, where the PUSCH-based CSI collides with the soundingreference signal (SRS), the SRS may be dropped, the CSI-RS may bedropped, or configuration between the two may be relied on.

Unlike this, where no PUSCH is scheduled but a PUCCH is scheduled in theresource, if there is data to be transmitted and the resource isconfigured as a TBS (i.e., a resource for data transmission), the UE maybe configured to transmit CSI and data via UCI piggyback. Otherwise, theUE may be configured to transmit the CSI alone.

Unlike this, if the PUSCH-based CSI collides with a grant-free PUSCH(i.e., a PUSCH which is not based on a grant), the grant-free PUSCH mayhave a higher priority, or any one of the CSI or piggyback CSI may bedropped. This may be based on the network configuration.

The above-described collision may occur between the uplink(UL)/supplementary uplink (SUL), not in one carrier, or may occurbetween other UL carriers. In such a context, different processing maybe performed.

It is first assumed that the case of semi-persistent PUSCH is limited toonly one carrier when the UE receives UL/SUL configuration and maydynamically move the PUSCH resource between the UL/SUL. In connectionwith whether the assumption that one UE may transmit one PUSCHcorresponds, the following processing schemes may be considered.

For example, where the PUCCH and the PUSCH may simultaneously betransmitted in the UL/SUL, it may be assumed that simultaneoustransmission of the PUSCH and PUSCH for semi-persistent CSI (i.e.,UL-SCH-free PSUCH) is possible similarly. At this time, an additionalassumption may be made that piggyback is performed only in the powerlimited context.

And/or, in this case, the UL-SCH-free PUSCH may be simultaneouslytransmitted in the UL/SUL. At this time, an additional assumption may bemade that piggyback is performed only in the power limited context.

And/or, in this case, only one PUSCH may be assumed regardless of whathas been described above. Thus, such a method may be considered as topiggyback the CSI to the transmission PUSCH or drop the CSI.

And/or, in this case, it may be assumed that the PUSCH ofsemi-persistent CSI is transmitted always without UL-SCH uponconfiguring at least one or more UL carriers. At this time, anadditional assumption may be made that piggyback is performed only inthe power limited context.

As another example, where the UE is configured for several carriers, theUL-SCH-free PUSCH, like in the above-described SUL case, may beconfigured to perform similar processing to that of the PUCCH.Accordingly, where the PUCCH and the PUSCH may be simultaneouslytransmitted, the UE may simultaneously transmit the UL-SCH-free PUSCHand other PUSCH.

Or, such a configuration may be made as to perform piggyback so that allthe UCIs are transmitted via one PUSCH by regarding it as theUL-SCH-free PUSCH. In this case, if the CSI of the UL-SCH-free PUSCH istransmitted via other PUSCH, the corresponding channel may be dropped.

Or, such a configuration applies only when the two PUSCHs collide in onecarrier and, otherwise, the UL-SCH-free PUSCH and the PUSCH may beconfigured to be transmitted simultaneously. Such a configuration mayalso be configured that when power is not limited, the correspondingscheme is supported and, if power is limited, UCI piggyback is carriedout between carriers.

If the UE assumes that the measurement resource for CSI reporting isinvalid (e.g., upon failing to receive the dynamic SFI), CSI reportingmay not be performed. Or, where the bandwidth part (BWP) of the UEchanges between the measurement reference resource and the report, ifthe reporting configuration in the BWP lacks a measurement link with theresource set corresponding to the prior reference resource, the UE maydrop the CSI report.

For example, when RS configuration 1 of DL BWP1 and reportingconfiguration 1 of UL BWP1 are a single link, new DL BWP2 includes RSconfiguration 1, but UL BWP2 may include reporting configuration 2instead of reporting configuration 1. At this time, if reportingconfiguration 2 has no measurement link relationship with reportingconfiguration 1, reporting for reporting configuration 1 may be dropped.In other words, although those for the reference resource follow the DLBWP and measurement is also performed according to the DL BWP, if thereporting configuration is varied as the UL BWP is changed, the UE maybe configured not to report invalid reference resources while assumingthat only the reporting configuration mapped to the correspondingreporting configuration is valid. Similarly, even when the DL BWP isvaried so that the reference resource is changed, if there is no mappingbetween the reporting configuration and the changed resourceconfiguration, the UE may determine that this is invalid.

To that end, it may be assumed that there is a resource configurationper DL BWP, and such resources are mapped. At this time, if the resourceconfiguration includes a configuration for other region than the BWP, itmay be assumed that only the resource in the BWP is valid.

And/or, it may also be assumed that there is a reporting configurationper UL BWP and such a reporting configuration is present. In this case,each report type and resource may be configured per BWP.

And/or, each resource-report link configuration (i.e., resource-reportmapping) may be configured regardless of the BWP. As an example, ifunpaired, such a mapping scheme may be configured according to eachDL-UL BWP pair.

And/or, in the case of feedback scheme 1, the UE may assume that theresource configuration in the active DL BWP is valid. The UE may alsoassume that the resource configuration in the active UL BWP is valid.Further, the UE may be configured to feedback only valid resource-reportmapping of the measurement link configuration. Such a method may beassumed to apply only to periodic CSI (P-CSI) or semi-persistent CSI(SP-CSI).

And/or, upon each validation command, the UE may receive configurationof the CSI reporting configuration that may be activated per configuredUL BWP. This may mean configuring the SP-CSI activated for the UL BWPconfigured by one MAC CE or DCI. In this case, when a configuration isgiven with no UL BWP index or per UL BWP using the index (e.g., ID) ofthe reporting configuration per UL BWP, activation may be performed onthe per-configured UL BWP configurations.

For example, where 2, 3, 4, and 5 reports are configured for four ULBWPs, the indexes of 0-1, 2-4, 5-8, and 9-13 may be allocated to the ULBWPs, and activation may be performed per index. It is assumed that theindex is activated only when the corresponding UL BWP is activated andit is activated by the DCI and/or MAC CE.

Further, one resource configuration may belong to a plurality of ULBWPs. Thus, the UL BWP applied per reporting configuration may beconfigured, and activation may be carried out using each index. Wherethe corresponding reporting configuration is activated, and one of theapplied UL BWPs is activated, the corresponding report may be assumed tobe valid. Further, the UE may perform measurement using the resourcelinked to the corresponding report.

Or, a similar scheme to those described above may apply to themeasurement link index. A UL BWP set and a DL BWP set applicable permeasurement link configuration may be configured for the UE. It may beassumed that each measurement link configuration is valid when the UL/DLBWPs are activated one-by-one in each set.

The UE may determine the activated/valid reporting set according to theactive UL BWP and designate a reference resource according to theresource configuration associated with the corresponding report. If noreference resource is included in the current BWP, the UE may assumethat the reference resource is invalid and drop it. Such a scheme mayapply only to periodic CSI or semi-persistent CSI.

The above-described CSI-related configurations may be summarized asfollows.

First, the measurement link configuration may include the reportingconfiguration (reporting config), resource configuration (resourceconfig), measurement configuration (measurement config), available ULBWP set, available UL BWP set (or available DL/UL BWP pair set), etc.Based on the measurement link configuration, the UE may determine themeasurement link configuration applicable according to the currentactivated DL/UL BWP and assume that only the activated configurations ofthe same are valid. Further, the index of the measurement linkconfiguration and/or the index of the reporting configuration may beassumed to be transmitted via the activated MAC-CE and/or DCI. Where theindex of the reporting configuration is transmitted, the measurementlink configuration associated with the configuration may be assumed tobe valid.

Next, the measurement reporting configuration may include a set ofavailable UL BWPs. Based on the measurement link configuration, the UEmay determine the measurement reporting configuration applicableaccording to the current activated UL BWP and assume that only theactivated configurations of the same are valid. Further, the index ofthe measurement link configuration and/or the index of the reportingconfiguration may be assumed to be transmitted via the activated MAC-CEand/or DCI. Where the index of the reporting configuration istransmitted, the measurement link configuration associated with theconfiguration may be assumed to be valid. Further, where the index ofthe measurement link configuration is transmitted, the reportingconfiguration belonging to the measurement link may be assumed to bevalid.

Next, in the case of per-BWP measurement reporting and reference signal(i.e., resource of reference signal) configuration, the UE may assumethat the activated sets of the reference signal configuration andreporting in the activated BWP are activated. At this time, if theactivated BWP is changed, it may be assumed that the corresponding setis varied.

At this time, it may be required to separately process the reportingconfiguration and the reference signal configuration (i.e., referencesignal resource configuration) assuming that the DL BWP and the UL BWPare separately varied. In this case, the reporting configuration set isvaried according to the UL BWP, and the UE may assume that onlymeasurement link configurations are reported in which the referencesignal associated with the activated reporting configurations of thecorresponding reporting configurations is valid.

Alternatively, reporting configurations and reference signalconfigurations may be designated for all the DL-UL BWP pairs, and areporting configuration and reference signal configuration may beselected according to the activated DL-UL BWP pair.

And/or, in the case of feedback scheme 2, the UE may be configured todetermine the reporting configuration according to the UL BWP andperform measurement on the reference resource associated with the reportset via the measurement gap if it is off the DL BWP. In this case, theUE may perform switching to the corresponding reference resource andmeasurement on the reference resource based on the measurement gap. Sucha scheme may apply only to aperiodic CSI (AP-CSI).

The CSI reporting-related CSI reporting configuration and referencesignal configuration (i.e., reference signal resource configuration)(e.g., CSI-RS resource configuration) may be configured and/or assumedas described above.

In connection with the above-described CSI reporting and measurement,described below according to the disclosure are a method forsemi-persistent CSI configuration (hereinafter, a first embodiment), amethod of identifying the DCI for semi-persistent CSI configuration(hereinafter, a second embodiment), a method of activation configurationbetween the semi-persistent CSI configuration and the BWP (hereinafter,a third embodiment), a method of identifying the CSI configurationrelated to the slot format and/or time division duplexing (TDD)configuration (hereinafter, a fourth embodiment), and a method ofprocessing the validity of CSI configuration (hereinafter, a fifthembodiment).

The embodiments described below are divided for ease of description, andthe respective configurations of the embodiments may be combinedtogether or replaced with each other.

Although image signal processor CSI configuration using periodic PUSCHis described in the following embodiments, the methods proposed hereinmay also apply to PUCCH-based semi-persistent, periodic, and aperiodicCSI configurations.

First Embodiment

First, a method for configuring a semi-persistent CSI is described. Asset forth above, periodic PUSCHs may be allocated to (or configured for)the UE for persistent CSI transmission. At this time, as methods forallocating the periodic PUSCHs to the UE, legacy semi-persistentscheduling (SPS) and/or grant-free UL transmission may be considered.

To reduce signaling overhead or grant-to-UL transmission delay occurringto the UE, the legacy system (e.g., LTE system) and the next-generationsystem (e.g., NR system) allocates periodic PUSCHs to the UE using,e.g., physical layer signaling (e.g., L1 signaling) and/or higher layersignaling. Thus, the PUSCH may be allocated using a similar scheme toperiodic PUSCH allocation (for user data, i.e., UE data), and uplinkcontrol information (UCI) may be transmitted in the PUSCH.

What may be considered first is a method of configuring periodic PUSCHsfor CSI based on the legacy SPS and/or grant-free procedure. In otherwords, to allocate periodic PUSCHs for CSI, SPS and/or grant-freeconfiguration may be used. In particular, the SPS and/or grant-freeconfiguration may include whether random or pre-configured UCI istransmittable and/or whether UCI piggyback is possible.

Specifically, the UE may be configured to support at least one of modes1 to 3 as follows.

For example, based on the SPS and/or grant-free configuration, the UEmay be configured to transmit data only in the PUSCH (mode 1).

As another example, based on the SPS and/or grant-free configuration,the UE may be configured to transmit only UCI, but not data (i.e., UEdata or UL-SCH), in the PUSCH (mode 2). At this time, the transmittableUCI may be pre-configured by physical layer signaling (e.g., L1signaling) and/or higher layer signaling.

As an example, based on the SPS and/or grant-free configuration, the UEmay be configured to punctuate or rate-match part of the resourceelement to be transmitted in the data and transmit the UCI (mode 3). Atthis time, the transmittable UCI and/or per-UCI transmission method(e.g., punctuation or rate matching) may be pre-configured by physicallayer signaling (e.g., L1 signaling) and/or higher layer signaling.

Information for the mode used among the above-described modes, availablemode, type of UCI piggybackable, and/or piggyback method of each UCI maybe transferred or predefined by physical layer signaling and/or higherlayer signaling used for the SPS and/or grant-free configuration. As anexample, the base station may configure the available mode,transmittable UCI, and transmission method of the UCI for the UE byhigher layer signaling and indicate the same via the CQI request fieldof the physical signaling.

Further, in the UCI piggyback mode, the UCI piggyback may be performedin the same manner as the typical UCI transmission on PUSCH withoutseparate signaling. Or, where there is no separate signaling, thetypical piggyback method used for UCI on PUSCH may apply.

Whether the above-described modes are available and/or are used may beimplicitly indicated via physical layer signaling and/or higher layersignaling without adding a separate field or parameter. Specifically,where a combination of some parameters of the higher layer signaling, acombination of some field values of the physical layer signaling, and/oreach indicates a specific value or falls within a certain range, the UEmay determine that the specific mode is used or available.

For example, where the modulation and coding scheme (MCS) to be used forthe SPS and/or grant-free configuration indicates a value (e.g., areserved value) that is not used in common PUSCH transmission or aspecific value, the UE may determine that this is mode 2 (i.e., UCI onlymode). Where the allocated RB and/or transmittable transport block size(TBS) is a predetermined value or less, the UE may determine that thisis mode 1 (i.e., DATA only mode) for URLLC user data transmission ormode 2 (i.e., UCI only mode) for transmission of small-size UCI.

CSI transmission may require an additional configuration for, e.g., areference signal (transmitted by the base station) used for the UE tograsp the channel state, as well as the uplink resource fortransmission. Since such CSI information is time-sensitive, unlikecommon UL-SCH transmission, retransmission via the HARQ scheme may beunnecessary although transmission fails.

Thus, such a method may also be considered as to configure asemi-persistent CSI configuration separately from the legacy SPS and/orgrant-free configuration but apply PUSCH allocation for CSItransmission, in a similar manner to the SPS and/or grant-free scheme.

Specifically, to allocate the periodic PUSCH resource for CSItransmission, a separate configuration other than the SPS and/orgrant-free configuration, a semi-persistent CSI (SP-CSI) configurationmay be used.

For example, the SP-CSI configuration may consist of semi-static SP-CSIconfiguration and dynamic SP-CSI configuration. At this time, thesemi-static SP-CSI configuration may include configuration for CQI, PMI,and RI measurement and configuration for periodicity similarly to thelegacy periodic/aperiodic CSI reporting except for the uplink resource.The dynamic SP-CSI configuration may include information for the PUSCHresource and offset for the UE to use in CSI transmission and, ifnecessary, information necessary for CSI measurement.

Second Embodiment

By grant-free type 2 Ul data transmission, the SP-CSI on the PUSCH maybe activated/deactivated by the DCI. In the SP-CSI design, there need tobe considered a method of configuring the ‘resource’ and a method ofactivating the SP-CSI in the position where the SP-CSI is transmitted(i.e., semi-persistent PUSCH resource configuration).

Under the assumption that the PUSCH for SP-CSI transmits only SP-CSIwithout UL-SCH, the UE may regard it as UCI piggyback for theUL-SCH-free PUSCH. In this case, there may be need a mechanism forseparating the SP-CSI PUSCH configuration from other type 1/2configuration. Assuming that the PUSCH for SP-CSI may transport UL-SCH,it may normally be similar to the type 2 configuration. Since theresource of type 2 for UL-SCH is periodic, and the periodicity of SP-CSIfor UL-SCH has a chance of being aligned with the periodicity of type 2,the PUSCH resource for SP-CSI may need to be configured regardless ofthe presence or absence of UL-SCH.

In such a case, the type 2 framework may be reused for SP-CSI.

For example, at least two type 2 configurations may be supported for agiven cell. At this time, if two configurations are provided, one may beconfigured for UL-SCH-free SP-CSI and the other for the type 2 purposeconstituted of UL-SCH. Or, if a single configuration is given, such aconfiguration may be made that one type 2 configuration is used for theUL-SCH with an SP-CSI or UL-SCH-dedicated if the SP-CSI is activated.

As another example, if two configurations are given in the active DCIfor type 2, other RNTI may be available between the PUSCH of theUL-SCH-free SP-CSI and the type 2 PUSCH of the UL-SCH.

As another example, if one configuration is given in the active DCI fortype 2, the SP-CSI may be regarded as valid if an aperiodic CSI istriggered in the active DCI. Otherwise, the aperiodic CSI may beregarded as inactive.

If a dedicated configuration is assumed for other SP-CSI PUSCH than thetype 2 configuration in which the SP-CSI PUSCH may carry only CSIwithout UL-SCH, such a configuration may be made that separate RNTI isused between other configurations.

It also needs to be determined whether one SP-CSI reportingconfiguration is present per given cell or whether there may existmultiple SP-CSI reporting configurations that may select one or moredynamic cells via a physical layer-based activation signal. As anexample, where physical layer signaling (e.g., L1 signaling) needs toselect one or more SP-CSI reporting configurations, such a method may beconsidered in which the aperiodic CSI trigger field is reused in the ULgrant. In other words, the aperiodic CSI trigger field may be reused toactivate one or more of the SP-CSI configurations. In this case, it maybe assumed that mapping between the set of SP-CSI configurations and theaperiodic CSI trigger value is configured semi-statically.

In relation to what has been described above, a method of identifyingDCI for semi-persistent CSI configuration is described below in detail.

In the methods described above in connection with the first embodiment,the PUSCH resource information used for CSI transmission may betransferred via, e.g., DCI. At this time, to reduce the count of blinddecoding of the UE in the DCI format to be used, such a method may beused as to use the same UL grant as that used for common PUSCH resourceallocation or at least the same bit size of DCI.

In this case, an additional method may be necessary for distinguishingthe DCI for PUSCH allocation of semi-persistent SP-CSI from the commonUL grant of the same size of DCI received by the UE. To that end,methods 1 to 3 as follows may be considered.

(Method 1)

A first method to be considered is to include, in the common UL grant,an indicator (e.g., an n-bit indicator where n is a natural number)(i.e., indication information) for distinguishing the DCI for PUSCHallocation of semi-persistent CSI from the common UL grant (i.e., DCIfor common UL transmission).

Such an indicator may be used to distinguish the DCI for SPS and/orgrant-free, as well as the DCI for PUSCH allocation of semi-persistentCSI, from the UL grant.

(Method 2)

And/or, for the UE to distinguish the UL grant from the DCI for SP-CSI,such a method may be considered that the base station performs CRCscrambling of DCI of semi-persistent CSI with a separate RNTI differentfrom other UE identifier (e.g., C-RNTI or SPS-C-RNTI). In other words,the UL grant may be distinguished from the DCI for PUSCH allocation ofsemi-persistent CSI via the RNTI used for CRC scrambling on DCI.

At this time, the RNTI used may be allocated to the UE by the basestation's higher layer signaling or may be elicited (by the UE) from theexisting RNTI (e.g., C-RNTI or SPS-C-RNTI) previously allocated by aseparate preset rule.

Where multiple semi-persistent CSI configurations may be configured forone UE in one serving cell in using method 2 described above, themultiple RNTIs may be allocated for their respective semi-persistent CSIconfigurations. In other words, the RNTI used for DCI scrambling persemi-persistent CSI configuration may be set to differ.

Where multiple semi-persistent CSI configurations may be configured forone UE in one serving cell in using method 2 described above, anindicator (e.g., an n-bit indicator where n is a natural number) (i.e.,indication information) for distinguishing them may be included in theDCI format. In other words, multiple semi-persistent CSI configurationsmay be distinguished by the indicator.

Where multiple semi-persistent configurations may be configured for oneUE in one serving cell and the legacy DCI format is used in using method2 described above, the legacy DCI field may be used to distinguish them.

For example, where the legacy UL grant is used as the DCI format of theDCI for semi-persistent CSI, the HARQ process ID may be configured toindicate the index of each semi-persistent CSI configuration. Or, theindexes of different semi-persistent CSI configurations may be indicatedby the CQI request field. Specifically, information indicating theaperiodic CSI trigger may be used to activate one or multiplesemi-persistent CSI configurations. At this time, each bit and/or eachvalue of the information indicating the aperiodic CSI trigger may bemapped to the semi-persistent CSI configuration or semi-persistent CSIconfiguration set.

In other words, as described above, the aperiodic CSI trigger field maybe reused to activate one or more of the SP-CSI configurations. In thiscase, it may be assumed that mapping between the set of SP-CSIconfigurations and the aperiodic CSI trigger value is configuredsemi-statically.

Such a configuration may be made that the semi-persistent CSIconfiguration and the SPS and/or grant-free configuration use differentactivation/deactivation validation points in using method 2 describedabove.

For example, the RNTI and SP-CSI C-RNTI for the semi-persistent CSIconfiguration may be configured to be used only for activation ordeactivation of the semi-persistent CSI. In contrast, the RNTI andconfigured scheduling (CS)-RNTI for SPS and/or grant-free may be usedfor dynamic grant of allocating PUSCH resource of UL-SCH retransmissionas well as for activation and deactivation. Thus, although differentRNTIs are used, a more flexible validation point may be secured in theSP-CSI C-RNTI. Since the payload size of the UCI, e.g., CSI, may beobtained in other ways than the legacy TBS of UL-SCH, the parametersused for such calculation may be additionally used only for validationpoint for semi-persistent CSI signaling.

Specifically, in relation to DCI signaling using the RNTI (e.g., SP-CSIC-RNTI) for semi-persistent CSI, only the validation point used fordeactivation may be determined, and other signaling all may be assumedas active. At this time, the following DCI fields may be used asavailable to deactivation.

-   -   frequency-domain resource assignment    -   time-domain resource assignment    -   HARQ process number (HPN)    -   modulation and coding scheme (MCS)    -   new data indicator (NDI)    -   redundancy version (RV)    -   TPC command for scheduled PUSCH

To distinguish from the common DCI (e.g., UL grant), all such fieldvalues may be represented as 0's or 1's. In particular, since thedeactivation message need not transmission and resource allocation forthe message, the resource allocation used for determining transmissionparameter and resource allocation, HARQ process number, MCS, and/or RVfields may be configured to be used. Among the above-described DCIfields, only fields commonly used for DCI format 0_0 and DCI format 0_1may be defined. Such deactivation determination conditions may be set tobe similar to the determination conditions of deactivation DCI of SPSand/or grant-free.

As another example, some conditions may be added to the validation pointused for DCI signaling using CS-RNTI, and a validity check may beperformed on the activation or deactivation signaling of semi-persistentCSI. Specifically, the UE may be configured to determine that the DCImeeting both the condition used for UL-SCH triggering-free aperiodic CSIand the validation point of SPS and/or grant-free activation is thesemi-persistent CSI activation DCI.

(Method 3)

Further, the RNTI used for SPS and/or grant-free may be used forretransmission grant of SPS and/or grant-free transmission andactivation/deactivation of grant-free configuration and/or SPS. As setforth above, the CSI information that the UE transmits in CSItransmission is time-sensitive and, thus, HARQ scheme-basedretransmission may be unnecessary.

Thus, unlike the SPS and/or grant-free configuration, the uses of DCI inthe semi-persistent CSI may be more limited. In this case, although theDCI of the semi-persistent CSI is transmitted using the RNTI used in theSPS and/or grant-free, influence on the SPS and/or grant-freetransmission procedure may be small.

In connection, for the UE to distinguish the common UL grant from theDCI for semi-persistent CSI, if the base station performs CRC scramblingof DCI on the semi-persistent CSI, such a method may be considered as toadopt or use the RNTI used in the SPS and/or grant-free. At this time,if there are multiple RNTIs used in the SPS and/or grant-free, selectionof an RNTI may be carried out as in the following examples.

For example, where there is one RNTI for SPS and/or grant-free used inthe serving cell where the semi-persistent CSI is configured, the basestation and/or UE may use the RNTI as it is or modify and use the RNTIas per a preset rule.

As another example, where there is one RNTI for SPS and/or grant-freeused in the serving cell where the semi-persistent CSI is configured andthere are multiple semi-persistent CSI configurations, the base stationand/or UE may use the RNTI as it is or modify and use the RNTI as per apreset rule. If some unique index is present for the semi-persistent CSIconfiguration, the base station and/or UE may be configured to changethe RNTI for the SPS and/or grant-free using the index.

As another example, where there are multiple RNTIs for SPS and/orgrant-free used in the serving cell where the semi-persistent CSI isconfigured and there is one semi-persistent CSI configuration, the basestation and/or UE may use any one of the allocated RNTIs for the SPSand/or grant-free. If some unique index is present for the SPS and/orgrant-free configuration, the base station and/or UE may be configuredto use the RNTI for the SPS and/or grant-free of the first, last, or apreset index. At this time, the base station and/or UE may be configuredto use the RNTI for the SPS and/or grant-free as it is or modify and useit as per a preset rule.

As another example, where there are multiple RNTIs for the SPS and/orgrant-free used in the serving cell where the semi-persistent CSI isconfigured, there are multiple semi-persistent CSI configurations, andthe SPS and/or grant-free configuration and the semi-persistent CSIconfiguration each have an index, the base station and/or UE may beconfigured to select the RNTI for the SPS and/or grant-free of the sameindex. At this time, the base station and/or UE may be configured to usethe RNTI as it is or modify and use it as per a preset rule.

Where one RNTI is associated with two or more semi-persistent CSIconfigurations or SPS and/or grant-free configurations in one servingcell in using method 3 above, an indicator (e.g., an n-bit indicatorwhere n is a natural number) (i.e., indication information) fordistinguishing them may be included in the DCI format. In this case, theCRC scrambled DCI may be distinguished per configuration using the sameRNTI.

Further, where one RNTI is simultaneously associated with onesemi-persistent CSI configuration and one SPS and/or grant-freeconfiguration in one serving cell using method 3 above, thesemi-persistent CSI configuration and the SPS and/or grant-freeconfiguration may be configured to use different activation/deactivationvalidation points.

Further, where one RNTI is simultaneously associated with one SPS and/orgrant-free configuration and one or more semi-persistent CSIconfigurations in one serving cell using method 3 above, thesemi-persistent CSI configurations and the SPS and/or grant-freeconfiguration may be configured to use the same activation/deactivationvalidation point. Where each or a combination of some DCI field valuesexcept for the validation point indicates a specific value or fallswithin a certain range, the UE may determine that the DCI is one forsemi-persistent CSI configuration. Where multiple semi-persistent CSIconfigurations are associated with the RNTI, the corresponding schememay be used.

As an example, where the MCS field indicates a reserved value, aspecific value or more or less, the UE may determine that the DCI is onefor the semi-persistent CSI configuration. Or, where the allocated RB ortransmittable TBS is a predetermined value or less, the UE may determinethat the DCI is one for the semi-persistent CSI configuration. As aspecific example, where multiple semi-persistent CSI configurations areassociated with one RNTI, one of the multiple semi-persistent CSIconfigurations may be indicated via, e.g., the HARQ process field.

Third Embodiment

Further, the next-generation system (e.g., NR system) may considerUE-specifically allocating the frequency bandwidth the UE uses inbandwidth part (BWP) units. Thus, the frequency resource the UE uses maybe varied by signaling of the base station or by a predefined timer.

At this time, where the resource the UE uses is preset via semi-staticconfiguration (i.e., higher layer signaling) and/or physical layersignaling (e.g., L1 signaling), the UE may not use the correspondingresource by the BWP dynamically varied. In other words, where the BWP isvaried by dynamic signaling separately from the resource configured forthe UE, the UE may not use the preset resource. Given this, thefollowing methods may be taken into consideration.

(Method 1)

Specifically, such a scenario case is assumed as to allocateuplink/downlink (UL/DL) resource for the UE by semi-static configuration(e.g., RRC signaling) and/or physical layer signaling (e.g., L1signaling).

At this time, where the uplink (UL) resource for use in semi-persistentCSI reporting and/or the reference signal for use in CSI measurement isallocated, multiple resources and/or multiple reference signals may beallocated, and the UE may use them in different available BWPs. In otherwords, multiple resources and/or multiple reference signals may beallocated to different BWPs the UE may use (i.e., different BWPsconfigured to be used by the UE). At this time, multiple resourcesand/or multiple reference signals may be allocated to one or more BWPs(in duplicate).

In such a case, methods 1-1 and 1-2 as follows may be considered inrelation to BWP activation and semi-persistent CSI configurationactivation.

(Method 1-1)

It is assumed that in using method 1 above, some of the UL/DL resourcecandidates available to the UE are activated via physical layersignaling (e.g., L1 signaling) or the UL/DL resource available to the UEis allocated via higher layer signaling. At this time, multiple UL/DLresources available per BWP to the UE may be activated/deactivated, andthe UE may use the UL/DL resource of the activated BWP (i.e., activeBWP).

Specifically, where there are multiple UL/DL resource configurations (inparticular, semi-persistent CSI configuration or PUSCH configuration forSPS and/or grant-free) available to the UE per BWP, the UE may beconfigured to use only the UL/DL resource present in the activated BWPamong the configured or activated configurations.

In other words, in the case where the CSI configuration is used, theUL/DL resource to be used for CSI measurement and/or reporting may beconfigured for the UE over multiple BWPs. At this time, eachsemi-persistent CSI configuration may be activated regardless of whetherits associated BWP is active, and the UE may be configured to performCSI measurement and/or reporting only in the activated BWP.

At this time, the UL/DL resource available may be selectively activatedamong the candidates. The base station may notify the UE of theactivated resource set by signaling (e.g., MAC CE or DCI).

In other words, each configuration (e.g., the semi-persistent CSIconfiguration or SPS and/or grant-free configuration) may be activatedsimultaneously or separately regardless of whether the BWP is activated.Further, each configuration may include associated BWP information orindex. The UE may be configured to use only the activated configurationassociated with the activated BWP when the BWP is activated/deactivated.

(Method 1-2)

In using method 1 above, the UL/DL resource (or UL/DL resourcecandidate) available may be automatically activated/deactivated as theBWP is activated/deactivated.

It is assumed that some of the UL/DL resource candidates available tothe UE are activated via physical layer signaling (e.g., L1 signaling)or the UL/DL resource available to the UE is allocated via higher layersignaling. At this time, when the BWP is activated/deactivated, itsassociated UL/DL resource configuration (in particular, thesemi-persistent CSI configuration or SPS and/or grant-free PUSCHconfiguration) may be automatically activated/deactivated.

For example, where the BWP for UL/DL transmission is configured for theUE, and CSI configurations (e.g., CSI reporting configuration or CSI-RSresource configuration) are configured for the UE, the configuration(s)associated with the corresponding BWP among the CSI configurations maybe activated/deactivated depending on whether the BWP isactivated/deactivated.

This scheme eliminates the need for additional signaling to indicateactivation/deactivation for the CSI configuration, providing advantagein light signaling overhead. Since the UE determines theactivation/deactivation of the CSI configuration depending on theactivation/deactivation of BWP, the operation complexity of the UE maybe lowered.

(Method 2)

When multiple BWPs or BWP candidates are allocated to the UE, such ascenario case is assumed as to allocate uplink/downlink (UL/DL) resourcefor the UE by semi-static configuration (e.g., RRC signaling) and/orphysical layer signaling (e.g., L1 signaling).

At this time, where an uplink (UL) resource is allocated for use in SPSand/or grant-free transmission or semi-persistent CSI reporting, the DCIfor allocation of the PUSCH or PDSCH may be applied simultaneously toall the BWPs or all the BWP candidates allocated to the UE or be usedfor resource allocation.

As an example, the resource configuration included in the physical layeractivation signaling (e.g., L1 activation signaling) that the UEreceives for semi-persistent CSI configuration may be all or some of theBWPs/BWP candidates allocated to the UE. At this time, the length ofdifferent BWPs (e.g., N{circumflex over ( )}BWP_RB) may be set based onthe smallest BWP.

In connection with the methods of the above-described third embodiment,the following may also be considered.

The semi-static resource configuration including the semi-persistent CSI(SP-CSI) configuration, the SPS and/or grant-free configuration, and thescheduling request (SR) may be influenced by a change in the BWP. Inparticular, the PUSCH configuration such as the SPS and/or grant-freeand the activated/changed BWP may have a different number of resourceblocks (RBs) from the number of BWPs previously activated. In this case,the PUSCH allocated to the prior BWP needs to be deactivated or changed.In other words, if the BWP is deactivated, the related configuredresource may be automatically deactivated or be configured to beunavailable.

For seamless operation of such a configuration, several UL resource setsmay be configured for the UE over several BWPs and/or BWP candidates. Inthis case, when the BWP is activated (or deactivated), the related ULresource may become available (or unavailable). Besides, the sub set ofthe UL resources in the resource set may be set or indicated to beavailable or unavailable by higher layer signaling and/or physical layersignaling (e.g., L1 signaling). In this case, only the available ULresource may be varied to be resource available to the UE.

In connection, the following methods may be taken into consideration.

First, in the case of type 1 resource configuration, a separate resourceconfiguration may be used per configured UL BWP. At this time, theconfiguration of the current active UL BWP may be assumed to be validfor the type 1 resource.

In contrast, in the case of type 2 resource configuration, two methodsas follows may be considered.

First, valid check may be applied only to the current active UL BWP and,if the active UL BWP is changed, the type 2 resource previouslyactivated may be regarded as automatically invalidated. In this case, anew validity check may be required for the new active UL BWP for thetype 2 resource. Based on physical layer signaling (e.g., L1signal)-based activation, a similar scheme may also apply tosemi-persistent CSI PSUCH (SP-CSI PUSCH).

Or, if the validity of the type 2 resource is identified, activation forseveral resources (one resource per BWP) may be considered. For example,at least the PUSCH resource may be semi-statically configured per BWP,and physical layer signaling (L1 signaling) may be used to indicate theresource activated in several BWPs.

An additional method to be considered in this case may be to transmit avalidity check/invalidation DCI along with the index of the BWP thatactivates/deactivates the resource. For example, validation/invalidationof the type 2 resource or SP-CSI PUSCH may be done only by a physicallayer signal (e.g., L1 signal), and no assumption for BWP switching maybe considered. Further, validation/invalidation signaling may include aBWP index for activating/deactivating the resource of the inactive BWP.If a BWP switch occurs, the UE may assume that, if already activated,the type 2 resource or SP-CSI PUSCH is valid.

Fourth Embodiment

When the UL/DL resource configuration for CSI transmission (i.e., CSIreporting) and measurement is indicated as UL or DL by a dynamic SFI ina flexible slot, the corresponding resource may be configured asavailable. However, where the UE uses multiple resources in onetransmission, where the overall resource is unavailable, i.e., when noneof slots/mini-slots/symbols of the UL/DL resource used for transmissionare indicated with the UL/DL resource, the UE may determine that theentire resource is unavailable.

Given this, the following methods 1 and 2 may be taken intoconsideration.

(Method 1)

Such a scenario case is assumed in which the base station allocatesuplink/downlink (UL/DL) resource for the UE by semi-static configuration(e.g., RRC signaling) and/or physical layer signaling (e.g., L1signaling). In particular, it is assumed that the base station allocatesthe UL resource for use in SPS and/or grant-free transmission orsemi-persistent CSI reporting to the UE.

At this time, where the UE performs transmission over multiplescheduling units, when all the scheduling units are indicated as UL/DLby SFI or dynamic scheduling, the UE may be configured to determine thatthe corresponding resource is available.

(Method 2)

Such a scenario case is assumed in which the base station allocatesuplink/downlink (UL/DL) resource for the UE by semi-static configuration(e.g., RRC signaling) and/or physical layer signaling (e.g., L1signaling). In particular, it is assumed that the base station allocatesthe UL resource for use in SPS and/or grant-free transmission orsemi-persistent CSI reporting to the UE.

At this time, where the UE performs transmission over multiplescheduling units, the corresponding configuration may be regarded assemi-static SFI which may not be changed by dynamic scheduling ordynamic SFI.

Fifth Embodiment

Further, as described above, CSI transmission may require a referencesignal for CSI measurement, UL resource for CSI report transmission(i.e., CSI reporting), and link information about what reference signalof information is to be transferred in the UL resource.

Thus, only when the UL resource for CSI reporting of a certain CSIreport occasion and reference signal linked thereto both are valid, theUE may perform CSI transmission.

At this time, where either or both of the UL resource and the referencesignal linked thereto are invalid, the following methods may beconsidered.

First described is a case where at the CSI report occasion, the ULresource for CSI reporting is valid but the reference signal linkedthereto is invalid. In this case, the UE may be configured tore-transmit the CSI report previously transmitted or not to transmit theCSI report. In particular, where the UE fails to receive the SFI so thatthe reference signal is invalid, the UE may be configured to retransmitthe CSI report which has previously been transmitted.

At this time, where the reference signal linked to the UL resource forCSI reporting is invalid, the UE may be configured to use the availablereference signal most associated or positioned adjacent.

Where neither the UL resource for CSI reporting at the CSI reportoccasion nor the reference signal linked thereto is valid, the UE mayrefrain from transmitting the CSI report. That is, in this case, the UEmay not perform CSI reporting to the base station.

Where the UL resource for CSI reporting at the CSI report occasion isinvalid but the reference signal linked thereto is valid, the UE mayrefrain from transmitting the CSI report. That is, in this case, the UEmay not perform CSI reporting to the base station.

FIG. 11 is a flowchart illustrating operations of a UE performingchannel state information (CSI) reporting in a wireless communicationsystem to which a method proposed herein is applicable. FIG. 11 isintended merely for illustration purposes but not for limiting the scopeof the disclosure.

Referring to FIG. 11, it is assumed that the base station and/or UEperforms CSI measurement and/or reporting based on the methods describedabove in connection with the embodiments of the disclosure (inparticular, the method according to the third embodiment).

First, the UE may receive BWP configuration information for thebandwidth part (BWP) for UL and/or DL transmission from the base station(S1105). In this case, the BWP configuration information may includeconfiguration of one or more BWPs, and at least one of the one or moreBWPs may be set as an active BWP. The BWP configuration information maybe configured with the respective identifiers (IDs) of the BWPs.

The UE may receive reporting configuration information including areporting configuration for CSI reporting from the base station (S1110).Here, the reporting configuration may be referred to as CSI reportingconfiguration, and there may be included one or more reportingconfigurations. In this case, each reporting configuration may have arelationship with the resource configuration (e.g., CSI-RSconfiguration) for CSI measurement and the BWP.

Thereafter, the UE may perform CSI reporting based on the BWPconfiguration information and reporting configuration informationreceived from the base station (S1115).

At this time, the reporting configuration received from the base stationmay be associated with the BWP received from the base station in whichcase whether the reporting configuration is activated may be determinedbased on whether the BWP is activated. For example, as in method 1-2described above in connection with the third embodiment, when the BWP isactivated/deactivated, its associated UL/DL resource configuration (inparticular, the semi-persistent CSI configuration or SPS and/orgrant-free PUSCH configuration) may be automaticallyactivated/deactivated. In this case, whether the BWP is activated may beset by dynamic signaling (e.g., DCI) of the base station.

The CSI reporting of FIG. 11 may be CSI reporting configuredsemi-persistently, i.e., SP-CSI reporting, and CSI reporting may beperformed via the PUSCH or PUCCH.

The reporting configuration of FIG. 11 may include resourceconfiguration information (e.g., CSI-RS resource configuration for CSImeasurement) related to CSI reporting, and the resource configurationinformation may include information (e.g., BWP identifier) for the BWPassociated therewith.

In connection, the UE may be configured as a device shown in FIGS. 13and 14. Given this, the operations of FIG. 11 described above may beperformed by the device of FIGS. 13 and 14.

For example, a processor 1321 (and/or a processor 1410) may receive BWPconfiguration information for the bandwidth part (BWP) for UL and/or DLtransmission from the base station (S1105). The processor 1321 (and/orthe processor 1410) may receive reporting configuration informationincluding a reporting configuration for CSI reporting from the basestation (S1110). Further, the processor 1321 (and/or the processor 1410)may perform CSI reporting based on the BWP configuration information andreporting configuration information received from the base station(S1115).

FIG. 12 is a flowchart illustrating operations of a base stationreceiving channel state information (CSI) reporting in a wirelesscommunication system to which a method proposed herein is applicable.FIG. 12 is intended merely for illustration purposes but not forlimiting the scope of the disclosure.

Referring to FIG. 12, it is assumed that the base station and/or UEperforms CSI measurement and/or reporting based on the methods describedabove in connection with the embodiments of the disclosure (inparticular, the method according to the third embodiment).

First, the base station may transmit BWP configuration information forthe bandwidth part (BWP) for UL and/or DL transmission to the UE(S1205). In this case, the BWP configuration information may includeconfiguration of one or more BWPs, and at least one of the one or moreBWPs may be set as an active BWP. The BWP configuration information maybe configured with the respective identifiers (IDs) of the BWPs.

The base station may transmit reporting configuration informationincluding a reporting configuration for CSI reporting to the UE (S1210).Here, the reporting configuration may be referred to as CSI reportingconfiguration, and there may be included one or more reportingconfigurations. In this case, each reporting configuration may have arelationship with the resource configuration (e.g., CSI-RSconfiguration) for CSI measurement and the BWP.

Thereafter, the base station may receive CSI reporting (performed) basedon the BWP configuration information and reporting configurationinformation from the UE (S1215).

At this time, the reporting configuration may be associated with the BWPin which case whether the reporting configuration is activated may bedetermined based on whether the BWP is activated. For example, as inmethod 1-2 described above in connection with the third embodiment, whenthe BWP is activated/deactivated, its associated UL/DL resourceconfiguration (in particular, the semi-persistent CSI configuration orSPS and/or grant-free PUSCH configuration) may be automaticallyactivated/deactivated. In this case, whether the BWP is activated may beset by dynamic signaling (e.g., DCI) of the base station.

The CSI reporting of FIG. 12 may be CSI reporting configuredsemi-persistently, i.e., SP-CSI reporting, and CSI reporting may betransmitted/received via the PUSCH or PUCCH.

The reporting configuration of FIG. 12 may include resourceconfiguration information (e.g., CSI-RS resource configuration for CSImeasurement) related to CSI reporting, and the resource configurationinformation may include information (e.g., BWP identifier) for the BWPassociated therewith.

In connection, the base station may be configured as a device shown inFIG. 13. Given this, the operations of FIG. 12 described above may beperformed by the device of FIG. 13.

For example, the processor 1311 may transmit BWP configurationinformation for the bandwidth part (BWP) for UL and/or DL transmissionto the UE (S1205). The processor 1311 may transmit reportingconfiguration information including a reporting configuration for CSIreporting to the UE (S1210). The processor 1311 may receive CSIreporting (performed) based on the BWP configuration information andreporting configuration information from the UE (S1215).

Where the base station and/or the UE operate as described above inconnection with FIGS. 11 and 12, the need for additional signaling toindicate activation/deactivation for the CSI configuration iseliminated, providing advantage in light signaling overhead. Since theUE determines the activation/deactivation of the CSI configurationdepending on the activation/deactivation of BWP, the operationcomplexity of the UE may be lowered.

Overview of Devices to which Present Disclosure is Applicable

FIG. 13 illustrates a block diagram of a wireless communication deviceto which methods proposed in this specification may be applied.

Referring to FIG. 13, a wireless communication system includes a basestation 1310 and multiple UEs 1310 positioned within an area of the basestation 1320.

The BS 1310 includes a processor 1311, a memory 1312, and a radiofrequency (RF) unit 1313. The processor 1311 implements a function, aprocess, and/or a method which are proposed in FIGS. 1 to 12 above.Layers of a radio interface protocol may be implemented by the processor1311. The memory 1312 is connected with the processor 1311 to storevarious pieces of information for driving the processor 1311. The RFunit 1313 is connected with the processor 1311 to transmit and/orreceive a radio signal.

The UE 1320 includes a processor 1321, a memory 1322, and an RF unit1323.

The processor 1321 implements a function, a process, and/or a methodwhich are proposed in FIGS. 1 to 12 above. Layers of a radio interfaceprotocol may be implemented by the processor 1321. The memory 1322 isconnected with the processor 1321 to store various pieces of informationfor driving the processor 1321. The RF unit 1323 is connected with theprocessor 1321 to transmit and/or receive a radio signal.

The memories 1312 and 1322 may be positioned inside or outside theprocessors 1311 and 1321 and connected with the processors 1311 and 1321by various well-known means.

As an example, in a wireless communication system supporting a lowlatency service, the UE may include a radio frequency (RF) unit fortransmitting and receiving a radio signal and a processor functionallyconnected with the RF unit in order to transmit and receive downlink(DL) data.

Further, the base station 1310 and/or the UE 1320 may have a singleantenna or multiple antennas.

FIG. 14 is a block diagram of a communication device according to anembodiment of the present disclosure.

Particularly, FIG. 14 is a diagram illustrating a UE shown in FIG. 13 inmore detail.

Referring to FIG. 14, the UE includes a processor (or digital signalprocessor (DSP)) 1410, an RF module (or RF unit) 1435, a powermanagement module 1405, an antenna 1440, a battery 1455, a display 1415,a keypad 1420, a memory 1430, a subscriber identification module (SIM)card 1425 (optional), a speaker 1445 and a microphone 1450. The UE mayinclude a single antenna or multiple antennas.

The processor 1410 may be configured to implement the functions,procedures and/or methods proposed by the present disclosure asdescribed in FIGS. 1 to 9. Layers of a wireless interface protocol maybe implemented by the processor 1410.

The memory 1430 is connected to the processor 1410 and storesinformation related to operations of the processor 1410. The memory 1430may be located inside or outside the processor and may be connected tothe processors through various well-known means.

A user enters instructional information, such as a telephone number, forexample, by pushing the buttons of a keypad 1420 or by voice activationusing the microphone 1450. The processor receives and processes theinstructional information to perform the appropriate function, such asto dial the telephone number. Operational data may be retrieved from theSIM card 1425 or the memory 1430 to perform the function. Furthermore,the processor may display the instructional and operational informationon the display 1415 for the user's reference and convenience.

The RF module 1435 is connected to the processor and transmits and/orreceives an RF signal. The processor forwards instructional informationto the RF module, to initiate communication, for example, transmitsradio signals comprising voice communication data. The RF moduleincludes a receiver and a transmitter to receive and transmit radiosignals. An antenna 1440 facilitates the transmission and reception ofradio signals. Upon receiving radio signals, the RF module may forwardand convert the signals to baseband frequency for processing by theprocessor. The processed signals may be transformed into audible orreadable information outputted via the speaker 1445.

FIG. 15 is a view illustrating an example RF module of a wirelesscommunication device to which a method proposed herein is applicable.

Specifically, FIG. 15 illustrates an example RF module that may beimplemented in a frequency division duplex (FDD) system.

First, in a transmission path, the processor described above inconnection with FIGS. 13 and 14 processes data to be transmitted andprovides an analog output signal to a transmitter 1510.

In the transmitter 1510, the analog output signal is filtered by a lowpass filter (LPF) 1511 for removing images caused by digital-to-analogconversion (ADC), up-converted from baseband to RF by an up-converter(e.g., Mixer) 1512, and amplified by a variable gain amplifier (VGA)1513. The amplified signal is filtered by a filter 1514, furtheramplified by a power amplifier (PA) 1515, routed via duplexer(s)1550/antenna switch(es) 1560, and transmitted via an antenna 1570.

In a reception path, the antenna receives signals from the outside andprovides the received signals. The signals are routed via the antennaswitch(es) 1560/duplexers 1550 and are provided to a receiver 1520.

In the receiver 1520, the received signals are amplified by a low noiseamplifier (LNA) 1523, filtered by a band pass filter 1524, anddown-converted from RF to baseband by a down-converter (e.g., a mixer)1525.

The down-converted signals are filtered by a low pass filter (LPF) 1526and amplified by a VGA 1527 so that an analog input signal is obtained.The obtained analog input signal is provided to the processor describedabove in connection with FIGS. 13 and 14.

A local oscillator (LO) generator 1540 generates transmission andreception LO signals and provides them to the up-converter 1512 and thedown-converter 1525, respectively.

A phase locked loop (PLL) 1530 receives control signals from theprocessor to generate transmission and reception LO signals at properfrequencies and provide the control signals to the LO generator 1540.

The circuits shown in FIG. 15 may have a different arrangement than thatshown in FIG. 15.

FIG. 16 is a view illustrating another example RF module of a wirelesscommunication device to which a method proposed herein is applicable.

Specifically, FIG. 16 illustrates an example RF module that may beimplemented in a time division duplex (TDD) system.

In the TDD system, the transceiver 1610 and receiver 1620 of the RFmodule are identical in structure to the transceiver and receiver of theRF module in the FDD system.

The following description of the RF module of the TDD system focusesprimarily on differences from the RF module of the FDD system, and thedescription in connection with FIG. 15 may apply to the same structure.

The signal amplified by the power amplifier (PA) 1615 of the transmitteris routed via the band select switch 1650, the band pass filter (BPF)1660, and antenna switch(es) 1670 and is transmitted via the antenna1680.

In a reception path, the antenna receives signals from the outside andprovides the received signals. The signals are routed via the antennaswitch(es) 1670, band pass filter 1660, and band select switch 1650 andare provided to the receiver 1620.

The aforementioned embodiments are achieved by a combination ofstructural elements and features of the present disclosure in apredetermined manner. Each of the structural elements or features shouldbe considered selectively unless specified separately. Each of thestructural elements or features may be carried out without beingcombined with other structural elements or features. In addition, somestructural elements and/or features may be combined with one another toconstitute the embodiments of the present disclosure. The order ofoperations described in the embodiments of the present disclosure may bechanged. Some structural elements or features of one embodiment may beincluded in another embodiment, or may be replaced with correspondingstructural elements or features of another embodiment. Moreover, it isapparent that some claims referring to specific claims may be combinedwith another claims referring to the other claims other than thespecific claims to constitute the embodiment or add new claims by meansof amendment after the application is filed.

The embodiments of the present disclosure may be achieved by variousmeans, for example, hardware, firmware, software, or a combinationthereof. In a hardware configuration, the methods according to theembodiments of the present disclosure may be achieved by one or moreASICs (Application Specific Integrated Circuits), DSPs (Digital SignalProcessors), DSPDs (Digital Signal Processing Devices), PLDs(Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays),processors, controllers, microcontrollers, microprocessors, etc.

In a firmware or software configuration, the embodiments of the presentdisclosure may be implemented in the form of a module, a procedure, afunction, etc. Software code may be stored in the memory and executed bythe processor. The memory may be located at the interior or exterior ofthe processor and may transmit data to and receive data from theprocessor via various known means.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present disclosurewithout departing from the spirit or scope of the disclosures. Thus, itis intended that the present disclosure covers the modifications andvariations of this disclosure provided they come within the scope of theappended claims and their equivalents.

Although the scheme of transmitting/receiving channel state informationin the wireless communication system according to the disclosure hasbeen described in connection with examples in which it applies to 5Gsystems (new RAT systems), the scheme is also applicable to othervarious wireless communication systems.

What is claimed is:
 1. A method of performing channel state information(CSI) reporting by a user equipment (UE) in a wireless communicationsystem, the method comprising: receiving, from a base station, bandwidthpart (BWP) configuration information for one or more BWPs related to atleast one of uplink transmission or downlink transmission; receiving,from the base station, reporting configuration information for the CSIreporting, wherein the reporting configuration information includes oneor more reporting configurations and each of the one or more reportingconfigurations includes a BWP index related to one of the one or moreBWPs; and performing the CSI reporting based on the BWP configurationinformation and the reporting configuration information, wherein achange of an activated BWP among the one or more BWPs is based on (i) aspecific signaling or (ii) a pre-configured timer, wherein a specificreporting configuration, among the one or more reporting configurations,is activated based on a bit value of a specific field of downlinkcontrol information (DCI) related to triggering of the CSI reporting,and wherein, based on (i) the change of the activated BWP among the oneor more BWPs being based on the pre-configured timer, (ii) the specificreporting configuration being related to a semi-persistent CSIreporting, and (iii) the BWP index of the specific reportingconfiguration being related to the activated BWP among the one or moreBWPs: CSI reporting is performed through a physical uplink sharedchannel.
 2. The method of claim 1, wherein, based on the BWP index ofthe specific reporting configuration being related to a deactivated BWPamong the one or more BWPs, the CSI reporting is not performed.
 3. Themethod of claim 2, wherein the specific signaling is based on dynamicsignaling by the base station.
 4. The method of claim 1, wherein thereporting configuration information includes resource configurationinformation related to the CSI reporting, and wherein the resourceconfiguration information includes information for the one of the one ormore BWPs.
 5. A method of receiving channel state information (CSI) by abase station in a wireless communication system, the method comprising:transmitting, to a user equipment (UE), bandwidth part (BWP)configuration information for one or more BWPs related to at least oneof uplink transmission or downlink transmission; transmitting, to theUE, reporting configuration information for the CSI reporting, whereinthe reporting configuration information includes one or more reportingconfigurations, and each of the one or more reporting configurationsincludes a BWP index related to one of the one or more BWPs; andreceiving, from the UE, the CSI reporting based on the BWP configurationinformation and the reporting configuration information, wherein achange of an activated BWP among the one or more BWPs is based on (i) aspecific signaling or (ii) a pre-configured timer, wherein a specificreporting configuration, among the one or more reporting configurations,is activated based on a bit value of a specific field of downlinkcontrol information (DCI) related to triggering of the CSI reporting,and wherein, based on (i) the change of the activated BWP among the oneor more BWPs being based on the pre-configured timer, (ii) the specificreporting configuration being related to a semi-persistent CSIreporting, and (iii) the BWP index of the specific reportingconfiguration being related to the activated BWP among the one or moreBWPs: CSI reporting is performed through a physical uplink sharedchannel.
 6. The method of claim 5, wherein, based on the BWP index ofthe specific reporting configuration being related to a deactivated BWPamong the one or more BWPs, the CSI reporting is not performed.
 7. Themethod of claim 6, wherein the specific signaling is based on dynamicsignaling by the base station.
 8. The method of claim 5, wherein thereporting configuration information includes resource configurationinformation related to the CSI reporting, and wherein the resourceconfiguration information includes information for the one of the one ormore BWPs.
 9. A user equipment (UE) configured to perform channel stateinformation (CSI) reporting in a wireless communication system, the UEcomprising: a radio frequency (RF) unit for transmitting/receiving aradio signal; and a processor functionally connected with the RF unit,wherein the processor performs control to: receive, from a base station,bandwidth part (BWP) configuration information for one or more BWPsrelated to at least one of uplink transmission or downlink transmission;receive, from the base station, reporting configuration information forthe CSI reporting, wherein the reporting configuration informationincludes one or more reporting configurations and each of the one ormore reporting configurations includes a BWP index related to one of theone or more BWPs; and perform the CSI reporting based on the BWPconfiguration information and the reporting configuration information,wherein a change of an activated BWP among the one or more BWPs is basedon (i) a specific signaling or (ii) a pre-configured timer, wherein aspecific reporting configuration, among the one or more reportingconfigurations, is activated based on a bit value of a specific field ofdownlink control information (DCI) related to triggering of the CSIreporting, and wherein, based on (i) the change of the activated BWPamong the one or more BWPs being based on the pre-configured timer, (ii)the specific reporting configuration the DCI being related to asemi-persistent CSI reporting, and (iii) the BWP index of the specificreporting configuration being related to the activated BWP among the oneor more BWPs: CSI reporting is performed through a physical uplinkshared channel.